Search

Nano-organic montmorillonite (OMMT) not only inhibits the harmful asphalt fume generation during the production and construction processes of asphalt mixtures but also effectively improves the performance of asphalt pavements. In order to prepare asphalt materials with smoke suppression effects and good road performance, this study selects nano-OMMT and SBS-modified asphalt for composite modification of asphalt mixtures and systematically investigates its road performance. Through the temperature sweep test, the frequency sweep test, the multiple stress creep recovery (MSCR) test, the bending beam rheometer (BBR) test, and the atomic force microscope (AFM) test, the high-temperature rheological properties, low-temperature rheological properties, high-temperature properties and aging resistance of the modified asphalt are studied. The research findings indicate that OMMT can effectively reduce the sensitivity of modified asphalt to load stress and improve its high-temperature rheological properties. SBS-modified asphalt shows increased creep stiffness and a decreased creep rate after OMMT modification, resulting in reduced flexibility and decreased low-temperature crack resistance. After short-term and long-term aging, the complex modulus aging index of OMMT/SBS composite-modified asphalt is lower than that of SBS-modified asphalt, and the phase angle aging index is higher than that of SBS-modified asphalt, demonstrating that OMMT enhances the aging resistance of SBS-modified asphalt. OMMT inhibits oxidation reactions in the asphalt matrix, reducing the formation of C=O and S=O bonds, thereby slowing down the aging process of modified asphalt and improving its aging resistance. [ABSTRACT FROM AUTHOR]

Paper relics, as carrieres of historical civilization's records and inheritance, could be severely acidic and brittle over time. In this study, the multi-functional dispersion of nanometer magnesium oxide (MgO) carried by 3-aminopropyl triethoxysilane-modified bacterial cellulose (KH550-BC) was applied in the impregnation process to repair aged paper, aiming at solving the key problems of anti-acid and strength recovery in the protection of ancient books. The KH550-BC/MgO treatment demonstrated enhanced functional efficacy in repairing aged paper, attributed to the homogeneous and stable distribution of MgO within the nanofibers of BC networks, with minimal impact on the paper's wettability and color. Furthermore, the treatment facilitated the formation of adequate alkali reserves and hydrogen bonding, resulting in superior anti-aging properties in the treated paper during prolonged preservation. Even after 30 days of hygrothermal aging tests, the paper repaired by KH550-BC/MgO was still in a gently alkaline environment (pH was about 7.56), alongside a 32.18% elevation compared to the untreated paper regarding the tear index. The results of this work indicate that KH550-BC/MgO is an effective reinforcement material for improving the long-term restoration of ancient books. [ABSTRACT FROM AUTHOR]

To address the challenges of difficulty and low penetration speed of aqueous deacidification agents in paper, we aimed to enhance the wetting performance of these agents by incorporating a surfactant. We selected four surfactants for our study: anionic sodium dodecyl benzene sulfonate (SDBS), cationic cetyltrimethylammonium bromide (CTAB), nonionic polysorbate-80 (TW80), and polyether-modified trisiloxane (TRSE). The wetting properties of these surfactants on sodium propionate aqueous deacidification agent, the alkali stability of the solution, and the effects of moist heat aging on paper durability were explored. The results demonstrated that TRSE exhibited superior performance compared to the other three surfactants, effectively reducing the surface tension of sodium propionate solution to 21.02 mN/m. In alkaline conditions with a pH range of 8.00–10.00, the surface tension of SDBS, CTAB, and TW80 solutions remained stable for 30 days. Similarly, under weakly alkaline conditions with a pH value below 9, the surface tension of TRSE solutions exhibited stability. It should be noted that SDBS accelerated the decline of paper tensile index and whiteness during the heat and humidity aging process; at the same time, CTAB, TW80, and TRSE had no noticeable adverse effects on paper aging resistance. [ABSTRACT FROM AUTHOR]

Wood plastic composites (WPC) were prepared using KH-570 modified wood flour and polypropylene (PP), and the mechanical properties and aging resistance of WPC were studied. The results show that when the wood flour content is 30%, WPC with the best comprehensive properties such as mechanical properties and aging resistance can be prepared. At this time, the tensile strength and bending strength of WPC reaches their maximum values, which are 5.2% and 56.5% higher than pure PP, respectively. The tensile strength and bending strength of WPC after UV aging are 2.7% and 20.6% higher than pure PP plastic, respectively. WPC has the highest tensile strength and bending strength after water resistance, which are 3.0% and 18.8% higher than pure PP plastic, respectively. The Vicat softening temperature of WPC reaches its maximum value, which is 10 °C higher than that of pure PP plastic. The quality loss rate after mold corrosion resistance is 0.82%. [ABSTRACT FROM AUTHOR]

In order to prolong the effective time of the self-healing properties of waterborne coatings containing shellac microcapsules coated with melamine rice husk powder (MRHP), three kinds of MRHPs with better microscopic morphologies, which contain 2.8% (type A), 5.5% (type B), and 8.0% (type C) of a rice husk powder (RHP), in shell materials were mixed according to three different proportions, and added to the waterborne coatings based on Tilia europaea L., under the conditions of the most proper addition amount of 6.0% microcapsules. The results indicated that the waterborne coatings containing mixed microcapsules can still maintain the best state in terms of optical properties and mechanical properties, with a chromatism of 1.10, an adhesion of zero, a hardness of 4H, an impact resistance of 7 kg·cm, and an elongation at break of 35.28%, respectively. According to the aging resistance test, the waterborne coating containing microcapsules "type A + type B + type C" demonstrated a longer effective time. After aging for 200 h in the UV climate resistance test chamber, the light loss rate at an incident angle of 60° was 2.91%. Through scratch testing, it is verified that the mixed microcapsules can prolong the self-healing time, reduce the crack size, and achieve a coating self-healing rate of 41.11%. They can also inhibit the crack growth rate to a certain extent. Roughness tests indicated that the surface roughness of the coating with mixed microcapsules increased by 0.038 μm in comparation with the single microcapsule, but the surface can still remain smooth after being covered by the topcoat without the microcapsules. Studying the ratio of mixed microcapsules provides new ideas for the optimization of a wood-based coating self-healing effect. [ABSTRACT FROM AUTHOR]

To enhance the properties of SBS and crumb rubber-modified asphalts, four different amounts (5%, 10%, 15%, and 20%) of castor oil were added to crumb rubber-modified asphalts to mitigate the adverse effects of high levels of fine crumb rubber particles on the aging resistance of SBS and crumb rubber-modified asphalt. Initially, a conventional test was conducted to assess the preliminary effects of bio-oil on the high-temperature and anti-aging properties of SBS and crumb rubber-modified asphalt. Subsequently, dynamic shear rheometer and bending beam rheometer tests were employed to evaluate the impact of bio-oil on the high- and low-temperature and anti-fatigue properties of SBS and crumb rubber-modified asphalt. Finally, fluorescence microscopy and Fourier transform infrared spectroscopy were used to examine the micro-dispersion state of the modifier and functional groups in bio-oil, SBS and crumb rubber composite-modified asphalts. The experimental results indicated that bio-oil increased the penetration of SBS and crumb rubber-modified asphalt, decreased the softening point and viscosity, and significantly improved its aging resistance. The addition of bio-oil enhanced the anti-fatigue properties of SBS and crumb rubber-modified asphalt. The optimal amount of added bio-oil was identified. Bio-oil also positively influenced the low-temperature properties of SBS and crumb rubber-modified asphalt. Although the addition of bio-oil had some adverse effects on the asphalt's high-temperature properties, the asphalt mixture modified with bio-oil, SBS, and crumb rubber still exhibited superior high-temperature properties compared to unmodified asphalt. Furthermore, fluorescence microscopy and Fourier transform infrared spectroscopy results demonstrated that bio-oil can be uniformly dispersed in asphalt, forming a more uniform cross-linked structure and thereby enhancing the aging resistance of SBS and crumb rubber-modified asphalt. The modification process involved the physical blending of bio-oil, SBS, and crumb rubber within the asphalt. Comprehensive research confirmed that the addition of bio-oil has a significant and positive role in enhancing the properties of SBS and crumb rubber-modified asphalt with different composite crumb rubber particle size ratios. [ABSTRACT FROM AUTHOR]

Copyright of China Rubber Industry is the property of Editorial Office of China Rubber Industry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the rapid development of bridge construction, the service life of bridges and traffic volume continue to increase, leading to the gradual appearance of diseases such as potholes and cracks in bridge deck pavements under repeated external loads. These issues severely impact the safety and service life of bridges. The repair of bridge deck potholes and cracks is crucial for ensuring the integrity and safety of bridge structures. Rapid repair materials designed for this purpose play a critical role in effectively and efficiently addressing these issues. In order to address the issues of pavement diseases, this study focuses on the rapid repair of epoxy concrete for bridge deck pavements and its performance is studied using experimental methods. Firstly, carbon black, rubber powder, and other materials were used to improve the elastic modulus and aging resistance of the epoxy concrete. Secondly, the addition of solid asphalt particles provided thermal sensitivity to the repair material. Finally, various properties of the rapid repair epoxy concrete for bridge deck pavements were tested through experiments including compressive strength testing, elastic modulus measurement, thermal sensitivity testing, and anti-UV aging testing. The experimental results show that adding carbon black and rubber powder reduces the elastic modulus of epoxy concrete by 25% compared to normal epoxy concrete, while increasing its aging resistance by 1.8%. The inclusion of solid asphalt particles provided thermal sensitivity to the repair material, contributing to better stress coordination between the repair material and the original pavement material under different temperature conditions. The epoxy concrete has early strength, toughness, and anti-aging properties, making it suitable for rapid repair of bridge deck pavement. [ABSTRACT FROM AUTHOR]

Improving the aging resistance and elasticity of rubber materials can increase the service life of rubber pads and reduce railway operation costs. The purpose of this work was to improve aging resistance, decrease compression set and ratio of dynamic stiffness to static stiffness (Rd/s) of railway rubber pads by using environmentally friendly accelerators N‐t‐butyl‐2‐benzothiazole sulfenimide (TBSI) and tetrabenzylthiuram disulfide (TBzTD). The influence of the curing system on the properties of rubber pads was assessed using multiple techniques. Compared to sulfur/tetramethylthiuram disulfide (TMTD) /N‐cyclohexyl‐2‐benzothiazole sulfenamide (CZ), compression set of S/TBSI/TBZTD decreased to 29.5% from 35.7%, retention of elongation at break after hot air aging increased to 77.7% from 66.1%, and Rd/s decreased to 1.82 from 1.85. Thermogravimetry (TG) and derivative thermogravimetry (DTG) analysis indicated that maximum thermal decomposition temperature of TBSI/TBZTD was higher, which was the reason for the good aging resistance and low compression set results. Rubber processing analysis (RPA) demonstrated that the loss factor of TBSI/TBZTD was smaller. The rubber cured by TBSI/TBZTD had a higher crosslinking density and smaller loss factor, which decreased the Rd/s. This study provides a reference for preparing of environmentally friendly rubber pads with a low Rd/s and long service life. [ABSTRACT FROM AUTHOR]

• An uniform and effective deacidification method of acidified paper was proposed. • The mechanism of uniform deacidification was elucidated with capillary action. • This method can endow the treated paper with long-lasting aging resistance. • The mechanism of excellent aging resistance was clarified from microstructure. Deacidification is a necessary and urgent means of protecting acidified paper documents. However, the contradiction between deacidification efficiency and uniformity in existing aqueous or organic phase deacidification methods has not been resolved yet, which is mainly attributed to the differences in capillary action of paper on solvents with different polarities. In this work, a strategy of two-phase deacidification was proposed to achieve efficient and uniform deacidification and long-lasting aging resistance. Impregnation of nano magnesium oxide organic dispersion of deacidified paper achieved efficient batch deacidification and sufficient alkali reserve. Using ultrasonic atomization of saturated calcium hydroxide aqueous solution, the penetration of alkaline substances into paper promoted uniform deacidification based on strong capillary action. Meanwhile, microstructural reinforcement of paper fibers was achieved based on the multiple interactions. This method can endow the treated paper with better thermal stability and long-lasting aging resistance. After artificial accelerated aging for 30 d, the treated paper samples still maintained the highest tensile index (18.46 Nm/g), folding endurance (8.5 times), tear index (3.95 mN·m2/g) and displayed negligible chromatic aberration (∆ E = 2.46 ± 0.21). This method greatly extends the lifespan of acidified paper, which has significant value for the protection of paper documents. [Display omitted] [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Polymer modified asphalt containing dynamic chemical bonds has the potential to increase the service life of asphalt pavement due to its excellent self‐healing ability. The effect of this self‐healing accelerator with dynamic chemical bond on the rheological properties and aging resistance of asphalt binder is still unclear. In this study, a self‐healing polyurea elastomer (PUA) modified asphalt containing dynamic disulfide bonds was prepared. The high‐ and low‐temperature performance and fatigue resistance of PUA modified asphalt were studied through multiple stress creep, low‐temperature bending beam rheometer, mechanical glass transition temperature, and linear amplitude scanning tests. Moreover, considering the service environment of asphalt over a wide temperature range (−30–70°C), three rheological aging indices (RAI) were proposed. At the same time, the aging resistance of PUA modified asphalt was evaluated by chemical aging index (CAI) based on carbonyl and sulfoxide groups. Finally, a linear relationship is established between RAI and CAI over a wide temperature range. The experimental results show that self‐healing accelerators can increase the resistance to permanent deformation of asphalt by 47.41% and the fatigue resistance by 88.54%. The S value of PUA modified asphalt decreased by at most 33.21% and the m value increased by at most 35.23% compared with BA at −18°C. Moreover, PUA can improve the long‐term thermal oxygen aging resistance of asphalt binders by at least 38.33% over a wide temperature range. Highlights: Rheological properties of self‐healing polyurea elastomer modified asphalt.Aging resistance of self‐healing polyurea elastomer modified asphalt.Proposed rheological aging indices for different temperature ranges.Clarified the correlation between chemical–rheological aging indices. [ABSTRACT FROM AUTHOR]

Copyright of Coatings & Protection / Tuceng yu Fanghu is the property of Coating & Protection Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The utilization of epoxy resin (EP) is widespread across various industries. Nevertheless, its combustibility restricts its broader utilization. Additive flame retardants have proven effective in enhancing EP flame retardancy in recent decades. However, poor weather and aging resistance have always been the defects of added flame retardants. A reactive flame retardant (VPD) was synthesized from 3, 5‐diamino‐1, 2, 4‐triazole and phenylphosphonic dichloride, and was used to prepare VPD/EP flame retardant epoxy thermosets. The mechanical properties of the VPD/EP flame retardant epoxy thermosets are lower than those of pure epoxy, because the distance between molecules of VPD is increased compared with that of DDM, the cross‐linking density of the polymer after curing is decreased, and the intermolecular force is reduced. The VPD/EP flame retardant epoxy thermosets have a 40% reduction in total heat release compared to pure EP, an increase in limiting oxygen index value from 24.7% (pure EP) to 29.4%, and a V‐1 rating in UL‐94 testing. The obtained EP has not only good flame retardancy but also better weather resistance and aging resistance than additive flame retardants. Highlights: An intrinsic flame‐retardant P and N coacting EP was designed and synthesized.The intrinsic flame‐retardant EP has excellent weather and aging resistance.The presence of the P, the residual char generated by combustion is denser. [ABSTRACT FROM AUTHOR]

The organic expanded vermiculite (OEVMT) is a good anti-aging agent for asphalt binder due to its excellent heat and oxygen barrier properties. However, the application form of OEVMT is usually limited to being as a modifier for asphalt binder while seldom research takes it as an alternative to filler in asphalt mixture. Using the OEVMT as an alternative to filler has the potential to further improve the aging resistance of asphalt mixture in comparison with using the OEVMT as an asphalt binder modifier, because the amount of OEVMT in asphalt mixture can be largely increased in this case. In present study, different proportions of fillers in asphalt mixture were replaced by OEVMT to produce asphalt mixtures with better aging resistance. The effects of using OEVMT as an alternative to fillers on road performance and aging resistance of asphalt mixture were investigated. The results indicate that replacing a large proportion of fillers in asphalt mixture can lead to a poor moisture resistance of asphalt mixture. In comprehensive consideration of moisture, cracking and rutting resistances, the optimal proportion of filler that should be replaced by OEVMT is 12.5 %. In comparison with the form of using OEVMT as a modifier for asphalt binder, using an appropriate amount of OEVMT to replace limestone fillers in asphalt mixture can further enhance the aging resistance of asphalt mixture by increasing the amount of OEVMT in asphalt mixture.

Nano-organic montmorillonite (OMMT) not only inhibits the harmful asphalt fume generation during the production and construction processes of asphalt mixtures but also effectively improves the performance of asphalt pavements. In order to prepare asphalt materials with smoke suppression effects and good road performance, this study selects nano-OMMT and SBS-modified asphalt for composite modification of asphalt mixtures and systematically investigates its road performance. Through the temperature sweep test, the frequency sweep test, the multiple stress creep recovery (MSCR) test, the bending beam rheometer (BBR) test, and the atomic force microscope (AFM) test, the high-temperature rheological properties, low-temperature rheological properties, high-temperature properties and aging resistance of the modified asphalt are studied. The research findings indicate that OMMT can effectively reduce the sensitivity of modified asphalt to load stress and improve its high-temperature rheological properties. SBS-modified asphalt shows increased creep stiffness and a decreased creep rate after OMMT modification, resulting in reduced flexibility and decreased low-temperature crack resistance. After short-term and long-term aging, the complex modulus aging index of OMMT/SBS composite-modified asphalt is lower than that of SBS-modified asphalt, and the phase angle aging index is higher than that of SBS-modified asphalt, demonstrating that OMMT enhances the aging resistance of SBS-modified asphalt. OMMT inhibits oxidation reactions in the asphalt matrix, reducing the formation of C=O and S=O bonds, thereby slowing down the aging process of modified asphalt and improving its aging resistance.

The elasticity and aging resistance of nitrile butadiene rubber (NBR) will be reduced by reinforced filler. Herein, we report that polydopamine (PDA) polymerized in situ on graphene oxide (GO) to obtain polydopamine‐graphene oxide (PDA‐GO) nanofiller for simultaneously improving strength, elasticity and thermal oxidative aging‐resistant performance of NBR. The structure, composition and morphology of PDA‐GO and NBR composites were characterized. The effect of PDA‐GO on the performance of NBR was investigated. Results show that PDA microspheres improved the dispersion of GO in matrix. With incorporation 3 phr of PDA‐GO, the tensile strength of NBR raised from 3.8 to 9.2 MPa. It is satisfactory that the elasticity is also improved significantly. PDA‐GO/NBR composite equips better thermal oxidative stability and aging resistance. The tensile strength of 3 phr‐PDA‐GO/NBR after aging is even 3.4 MPa higher than that of unfilled NBR before aging. Our work proposes an insight for the manufacture of rubber composites with high strength, elasticity and aging resistance. Highlights: GO modified by PDA is prepared via an in‐situ polymerization process.In situ polymerized PDA microspheres greatly promotes the dispersion of GO in NBR matrix.NBR filled with PDA‐GO shows a superior strength and elasticity simultaneously.PDA‐GO endows NBR with prominent performance in aging resistance. [ABSTRACT FROM AUTHOR]

In recent years, the poor weather resistance and aging resistance of additive flame retardants have caused researchers to pay attention to reactive flame retardants. A novel P‐N coacting epoxy curing agent with intrinsic flame retardancy was designed and synthesized. The mechanical properties, crosslinking curing properties and flame‐retardant properties of intrinsic flame‐retardant epoxy resin were characterized. The results show that the cross‐linking curing performance of hexa (3,5‐diamino‐1,2,4 triazolyl)‐cyclotriphosphonitrile) (VCP) is lower than that of DDM. This is due to the decrease in cross‐linking density caused by the VCP ring molecular structure. Therefore, the mechanical properties of the epoxy resin cured with VCP decreased, but the flame‐retardant properties of the material significantly improved. The limiting oxygen index of the VCP/EP flame retardant epoxy thermosets was 27.3%, reaching the UL 94 V‐1 level. The peak heat release rate and total heat release rate of the VCP/EP flame retardant epoxy thermosets were significantly reduced. The flame retardancy mechanism was studied by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and x‐ray photoelectron spectroscopy. The results show that the intrinsic flame‐retardant P‐N coacting epoxy resin has excellent curing and flame‐retardant properties. [ABSTRACT FROM AUTHOR]

Copyright of New Building Materials / Xinxing Jianzhu Cailiao is the property of New Building Materials Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coatings & Protection / Tuceng yu Fanghu is the property of Coating & Protection Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Nanomaterials has been widely adopted in asphalt binder modification in pavement engineering. Considering the advantage of nano-Al2O3 in high-temperature resistance and chemical stability, this study investigated the feasibility of the nano-Al2O3 used in asphalt modification in terms of performances and mechanisms. The impact of the nano-Al2O3 content on modified asphalt binder's pavement performance was analyzed via aging resistance, low temperature performance, high temperature performance, and bonding performance using various tests (e.g. DSR test, BBR test, RTFOT test, and BBS test). Results showed that the nano-Al2O3 is capable of improving base asphalt's aging resistance, high temperature performance and bonding performance, while bringing an insignificant adverse impact on performance at low temperatures simultaneously. Moreover, modification mechanisms of the asphalt binder under the modification of nano-Al2O3 were revealed from a view of functional groups and molecular characteristics via Gel permeation chromatography (GPC) tests and Fourier transform infrared spectroscopy (FTIR) tests. According to the result, modification of base asphalt binder by nano-Al2O3 belongs to physical blended and inhibits the growth of sulfoxide groups during the aging process. Meanwhile, the nano-Al2O3 increases the base asphalt binder's molecular weight based on LMS percentage, number-average and weight-average. [ABSTRACT FROM AUTHOR]

Nanomaterials has been widely adopted in asphalt binder modification in pavement engineering. Considering the advantage of nano-Al2O3 in high-temperature resistance and chemical stability, this study investigated the feasibility of the nano-Al2O3 used in asphalt modification in terms of performances and mechanisms. The impact of the nano-Al2O3 content on modified asphalt binder's pavement performance was analyzed via aging resistance, low temperature performance, high temperature performance, and bonding performance using various tests (e.g. DSR test, BBR test, RTFOT test, and BBS test). Results showed that the nano-Al2O3 is capable of improving base asphalt's aging resistance, high temperature performance and bonding performance, while bringing an insignificant adverse impact on performance at low temperatures simultaneously. Moreover, modification mechanisms of the asphalt binder under the modification of nano-Al2O3 were revealed from a view of functional groups and molecular characteristics via Gel permeation chromatography (GPC) tests and Fourier transform infrared spectroscopy (FTIR) tests. According to the result, modification of base asphalt binder by nano-Al2O3 belongs to physical blended and inhibits the growth of sulfoxide groups during the aging process. Meanwhile, the nano-Al2O3 increases the base asphalt binder's molecular weight based on LMS percentage, number-average and weight-average. [ABSTRACT FROM AUTHOR]

This research focused on the stabilisation of anhydride-cured epoxy asphalt (EA) over thermal-oxidative aging. EA binders with graduated Irganox 1010 antioxidant contents at 0, 0.3, 0.6, 0.9, and 1.2 wt% were prepared and then subjected to accelerated oven-conditioning aging at 85 and 100°C. The thermal stability, viscosity, mechanical parameters, and chemical structure of EA containing Irganox 1010 were evaluated during aging. The results showed that Irganox 1010 contributed to enhanced thermal stability, higher initial viscosity, and longer allowable construction time for EA. The 0.3–0.9 wt% Irganox 1010 had good compatibility with EA without weakening performance. During aging, Irganox 1010 effectively restrained degradation of the EA binder's mechanical properties and the EA mixture's low-temperature deformation. The variations of functional groups indicate that Irganox 1010 prominently restrained the oxidation of the asphalt phase and lightly affected the post-curing of the resin phase. There was a strong correlation between decreasing rate of bending strain of the mixture and increasing rate of sulfoxide in the binder. The mutual synergistic effect of resin and antioxidant improves the oxidation resistance of asphalt. Considering the aging improvement and economic cost, it is recommended to use 0.6 wt% Irganox 1010 as an antioxidant for anhydride-cured EA. Highlights Epoxy asphalt (EA) binder and mixtures incorporating antioxidant Irganox 1010 were analysed. Irganox 1010 plays a crucial role in aging protection effect of EA binder and mixture. Irganox 1010 antioxidant prominently restrains the oxidation of the asphalt phase and lightly affects the post-curing of the resin phase. There was a strong correlation between the bending strain of mixture and sulfoxide of binder. Addition of 0.6 wt% Irganox 1010 is recommended as an antioxidant for EA materials. [ABSTRACT FROM AUTHOR]

The microstructure, magnetic properties, corrosion and aging resistance, and mechanical properties of Nd–Fe–B, (Nd, La, Ce)–Fe–B, and (Ce, La, Y)–Fe–B rubber magnets have been investigated. For Nd–Fe–B magnets, increasing particle size and filling ratio of magnetic particles not only improves the overall magnetic properties but also increases the tensile strength. Using the Nd26.4Fe67.6Co5B powder with particle size of 75–106 μm and filling ratio of 90%, the optimum magnetic properties with the coercivity Hcj = 738.2 kA m−1, remanence Jr = 0.51 T, and maximum energy product (BH)max = 43.5 kJ m−3 are obtained. The magnet also exhibits an enhanced tensile strength of 4.52 MPa owing to its compact and uniform microstructure. In addition, the magnetic properties of Hcj = 518 kA m−1, Jr = 0.34 T, and (BH)max = 20.6 kJ m−3 are obtained in the partial high‐abundance (Nd, La, Ce)–Fe–B rubber magnet, which is superior to some of commercial Nd–Fe–B rubber magnets. For full high‐abundance (Ce, La, Y)–Fe–B magnet, these values are 320 kA m−1, 0.27 T, and 10.5 kJ m−3, respectively. Despite its lower magnetic properties than Nd‐based rubber magnets, (Ce, La, Y)–Fe–B rubber magnet exhibits a competitive advantage over the Nd‐containing magnets in terms of corrosion resistance and aging resistance performance. Moreover, (Ce, La, Y)–Fe–B magnet shows a tensile strength of 7.86 MPa, which is nearly 74.2% and 56.8% higher than the Nd–Fe–B and (Nd, La, Ce)–Fe–B rubber magnets. The present results indicate that the Ce, La, and Y elements can be reasonably selected to manufacture flexible rare earths–Fe–B rubber magnets with a high performance/cost ratio and good performance stability. [ABSTRACT FROM AUTHOR]

The decorative and fireproof performance degradation of the grouting fireproof glass exposed to UV irradiation limits its application in the fire protection of buildings. To solve this issue, a transparent polyacrylamide/polyvinyl alcohol (PAM/PVA) interpenetrating network hydrogel was designed to prepare grouting fireproof glass with enhanced theheat insulation and anti-aging properties. The results show that the light transmittance of PAM/PVA interpenetrating network hydrogel decreases with the increased content of PVA, and a proper content of PVA in the PAM/PVA interpenetrating network is beneficial to maintain high optical transparency in the resulting hydrogel. Heat insulation test shows that the PAM/PVA interpenetrating network improves the water-locking ability of the resulting hydrogels, and the fireproof glass containing 3 wt% PVA shows the lowest backside temperature of 92.6 °C at 3600 s, which is 51.9% lower than that of fireproof glass with PAM only. Thermogravimetric (TG) and differential scanning calorimetry (DSC) analysis show that the PAM/PVA interpenetrating network hydrogel improves the thermal stability and charring ability of hydrogel, and the hydrogel containing 3 wt% PVA exhibits the best charring effect among the samples, showing the highest residual yield of 39.2 % at 800 °C. The analyses of decomposition products and char residues show that the PAM/PVA interpenetrating network hydrogel can extend the heat absorption process of water evaporation and improve the gas flame retardant efficiency. Accelerated aging test shows that the presence of PVA greatly slows down the blistering and yellowing phenomenon of fireproof glass, thus endowing the fireproof glass with the super durability of fire resistance. Especially, the backside temperature at 3600 s and light transmittance of the sample containing 2 wt% PVA after 168 h aging test only changed 19.2 °C and 1.9 %, respectively, compared to the those of unaged sample.

Isayev model and Piloyan model were used to fit the vulcanization kinetics parameters and reaction activation energy of ethylene-propylene-diene monomer (EPDM) /ethylene-propylene rubber (EPR) blends with different mass ratios of EPDM to EPR. The effects of mass ratio of EPDM to EPR on curing characteristics, physical and mechanical properties, and aging resistance of the blends were investigated. The results showed that Isayev model and Piloyan model could describe vulcanization reaction process of EPDM/EPR blends well, while Piloyan model could not describe scorch period reaction of the blends. With increasing amount of EPR, the activation energy of vulcanization reaction of the blends increased, vulcanization rate decreased, phy-sical and mechanical properties of the vulcanizates decreased, and the aging resistance improved.

Asphalt was modified by thermoplastic resin modifier amorphous poly-α-olefin (APAO) and styrene-butadiene rubber (SBR) and APAO/SBR composite modified asphalt was prepared. The basic properties of the composite modified asphalts were tested. The effect of the mass ratio of APAO to SBR on the high-temperature rheological properties of composite modified asphalt was investigated by Brookfield viscometer and dynamic shear rheometer. The results showed that with the increasing amount of APAO, the penetration, ductility, mass loss rate, and phase angle of APAO/SBR composite modified asphalt decreased gradually, while the softening point, viscosity and rutting factor increased gradually. APAO could improve the high-temperature rutting resistance of asphalt, and APAO/SBR composite modified asphalt exhibited a phenomenon of shear thinning.

Paper relics, as carrieres of historical civilization’s records and inheritance, could be severely acidic and brittle over time. In this study, the multi-functional dispersion of nanometer magnesium oxide (MgO) carried by 3-aminopropyl triethoxysilane-modified bacterial cellulose (KH550-BC) was applied in the impregnation process to repair aged paper, aiming at solving the key problems of anti-acid and strength recovery in the protection of ancient books. The KH550-BC/MgO treatment demonstrated enhanced functional efficacy in repairing aged paper, attributed to the homogeneous and stable distribution of MgO within the nanofibers of BC networks, with minimal impact on the paper’s wettability and color. Furthermore, the treatment facilitated the formation of adequate alkali reserves and hydrogen bonding, resulting in superior anti-aging properties in the treated paper during prolonged preservation. Even after 30 days of hygrothermal aging tests, the paper repaired by KH550-BC/MgO was still in a gently alkaline environment (pH was about 7.56), alongside a 32.18% elevation compared to the untreated paper regarding the tear index. The results of this work indicate that KH550-BC/MgO is an effective reinforcement material for improving the long-term restoration of ancient books.

To enhance the properties of SBS and crumb rubber-modified asphalts, four different amounts (5%, 10%, 15%, and 20%) of castor oil were added to crumb rubber-modified asphalts to mitigate the adverse effects of high levels of fine crumb rubber particles on the aging resistance of SBS and crumb rubber-modified asphalt. Initially, a conventional test was conducted to assess the preliminary effects of bio-oil on the high-temperature and anti-aging properties of SBS and crumb rubber-modified asphalt. Subsequently, dynamic shear rheometer and bending beam rheometer tests were employed to evaluate the impact of bio-oil on the high- and low-temperature and anti-fatigue properties of SBS and crumb rubber-modified asphalt. Finally, fluorescence microscopy and Fourier transform infrared spectroscopy were used to examine the micro-dispersion state of the modifier and functional groups in bio-oil, SBS and crumb rubber composite-modified asphalts. The experimental results indicated that bio-oil increased the penetration of SBS and crumb rubber-modified asphalt, decreased the softening point and viscosity, and significantly improved its aging resistance. The addition of bio-oil enhanced the anti-fatigue properties of SBS and crumb rubber-modified asphalt. The optimal amount of added bio-oil was identified. Bio-oil also positively influenced the low-temperature properties of SBS and crumb rubber-modified asphalt. Although the addition of bio-oil had some adverse effects on the asphalt’s high-temperature properties, the asphalt mixture modified with bio-oil, SBS, and crumb rubber still exhibited superior high-temperature properties compared to unmodified asphalt. Furthermore, fluorescence microscopy and Fourier transform infrared spectroscopy results demonstrated that bio-oil can be uniformly dispersed in asphalt, forming a more uniform cross-linked structure and thereby enhancing the aging resistance of SBS and crumb rubber-modified asphalt. The modification process involved the physical blending of bio-oil, SBS, and crumb rubber within the asphalt. Comprehensive research confirmed that the addition of bio-oil has a significant and positive role in enhancing the properties of SBS and crumb rubber-modified asphalt with different composite crumb rubber particle size ratios.

With the rapid development of bridge construction, the service life of bridges and traffic volume continue to increase, leading to the gradual appearance of diseases such as potholes and cracks in bridge deck pavements under repeated external loads. These issues severely impact the safety and service life of bridges. The repair of bridge deck potholes and cracks is crucial for ensuring the integrity and safety of bridge structures. Rapid repair materials designed for this purpose play a critical role in effectively and efficiently addressing these issues. In order to address the issues of pavement diseases, this study focuses on the rapid repair of epoxy concrete for bridge deck pavements and its performance is studied using experimental methods. Firstly, carbon black, rubber powder, and other materials were used to improve the elastic modulus and aging resistance of the epoxy concrete. Secondly, the addition of solid asphalt particles provided thermal sensitivity to the repair material. Finally, various properties of the rapid repair epoxy concrete for bridge deck pavements were tested through experiments including compressive strength testing, elastic modulus measurement, thermal sensitivity testing, and anti-UV aging testing. The experimental results show that adding carbon black and rubber powder reduces the elastic modulus of epoxy concrete by 25% compared to normal epoxy concrete, while increasing its aging resistance by 1.8%. The inclusion of solid asphalt particles provided thermal sensitivity to the repair material, contributing to better stress coordination between the repair material and the original pavement material under different temperature conditions. The epoxy concrete has early strength, toughness, and anti-aging properties, making it suitable for rapid repair of bridge deck pavement.

Reclaimed rubbers with different Mooney viscosity were used to replace all the aromatic oil and part of carbon black in the formula of passenger car tyre tread compounds. The effects of Mooney viscosity and carbon black replacement ratio of reclaimed rubber on curing characteristics, physical and mechanical properties, aging resistance and dynamic mechanical properties of tread vulcanizates were investigated. The results showed that when the replacement mass ratio of reclaimed rubber to carbon black was 5/1, the tread vulcanizates had better physical and mechanical properties and aging resistance. Compared with high Mooney viscosity reclaimed rubber, the tread vulcanizate with low Mooney viscosity reclaimed rubber had higher curing efficiency and better tensile properties. Both high and low Mooney viscosity reclaimed rubber could reduce the rolling resistance of tread vulcanizates, while the wear resistance was maintained.

Layered silicate materials were often used for bitumen modification, but their improvement effect on bitumen performance was limited due to their poor compatibility with bitumen. Introducing long-chain organic compounds on the surface of inorganic materials can make them exhibit solvent-free fluid characteristics, which can significantly enhance the compatibility between inorganic and organic materials. In this study, 3-(trimethoxysilyl propyl) dimethyl octadecyl ammonium chloride (DC5700) and nonylphenol polyoxyethylene ether sodium sulfate (NPES) were used to organically treat bentonite (Ben) to prepare solvent-free bentonite fluid (Ben-fluid) so as to effectively improve the overall performance of styrene-butadiene-styrene copolymer (SBS) modified bitumen (SMB). Ben and DC5700 organically treated bentonite (DC5700-Ben) were used as comparative samples. The microstructure, ultraviolet reflectance and lipophilicity of Ben, DC5700-Ben and Ben-fluid as well as fluidization characteristics of Ben-fluid were tested and characterized. The results of X-ray diffraction spectrometer and Fourier transform infrared spectrometer (FTIR) demonstrated that DC5700 intercalated into the layers of the Ben and chemically grafted on the Ben surface, and the NPES was anchored on DC5700 molecules through ionic bonds. Compared with Ben and DC5700-Ben, Ben-fluid had the highest ultraviolet reflectance and the best lipophilicity. As the temperature exceeded 82.3 ℃, the fluidization characteristics of Ben-fluid began to appear. Meanwhile, the effects of Ben-fluid on physical, rheological and aging properties of SMB were investigated. Ben-fluid was more conducive to enhance the high-temperature stability of SMB than Ben and DC5700-Ben, and has less adverse effects on the low-temperature physical and rheological properties. The aging results of different SMBs revealed that the change in physical properties of SMB containing Ben-fluid after thermal and ultraviolet aging was significantly lower than that of SMB containing Ben and DC5700-Ben. In addition, FTIR showed that compared with Ben and DC5700-Ben, the Ben-fluid could inhibit the increase of carbonyl index and the decrease of butadiene index of SMB after aging. Comprehensive analysis suggested that Ben-fluid was more conducive to improve the physical, rheological and anti-aging properties of SMB.

Asphalt is still regarded as the most common raw material for road paving. In the pursuit of more long-term sustainability and the creation of durable and resilient pavements, researchers are diligently exploring high-quality asphalt. The objective of this study was to delve into the behavior of carbon black (CB)-modified asphalt, through conducting the conventional tests. The determination of the optimal pyrolysis temperature for CB involved assessing productivity, ash content, oil absorption value, iodine absorption value, and scanning electron microscopy (SEM). The modification was undertaken to generate modified carbon black (MCB), involving nitric acid oxidation and hydroxymethylation. The MCB was confirmed through total acidity (T), carboxyl and lactone groups (P), and hydroxyl groups (Q), complemented by SEM, Fourier transform infrared spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) characterization. The optimal MCB dosage determination of 15 % was accomplished by employing three index tests. Fluorescence microscopy was employed to illustrate the dispersion compatibility between MCB and asphalt. To assess the high-temperature performance and resistance to aging of CB and MCB modified asphalt, dynamic shear rheometer (DSR) temperature scanning was employed. The findings revealed that MCB significantly enhanced the temperature sensitivity, viscosity, rheological properties, and high-temperature characteristics of the modified asphalt. Moreover, the incorporation of CB and MCB exhibited improved anti-aging behavior in the asphalt.

Rubberized asphalt has excellent environmental protection and road property, but its storage stability needs improvement. Existing studies have found that the compound modification of bone glue (BG) and crumb rubber (CR) can effectively raise the separation of CR in asphalt, along with outstanding comprehensive properties. Therefore, this paper explores the micro mechanism, aging performance, and engineering characteristics of bone glue and crumb rubber compound modified asphalt (BCCMA). First, the adhesion of BCCMA was evaluated by a static drop test, and a scanning electron microscope test revealed its microscopic surface morphology. Second, three aging indices using rheological tests were developed to evaluate the aging resistance ability of the BCCMA. Lastly, the road performance of the bone glue and crumb rubber compound modified asphalt mixture (BCCMAM) was investigated. The results indicate that the surface energy of BCCMA (15% BG and 20% CR) increased by 52.39% compared to the neat asphalt. BG can improve asphalt's aging resistance, and the BCCMA with a BG content of 10% has the lowest aging sensitivity. BG promotes the dispersion uniformity of CR in neat asphalt, making the low-temperature crack resistance, high-temperature stability, and water stability of BCCMAM better than rubberized asphalt mixture.

Three-dimensional (3D) printing is a versatile manufacturing method widely used in various industries due to its design flexibility, rapid production, and mechanical strength. Polyurethane (PU) is a biopolymer frequently employed in 3D printing applications, but its susceptibility to UV degradation limits its durability. To address this issue, various additives, including graphene, have been explored to enhance PU properties. Graphene, a two-dimensional carbon material, possesses remarkable mechanical and electrical properties, but challenges arise in its dispersion within the polymer matrix. Surface modification techniques, like polydopamine (PDA) coating, have been introduced to improve graphene's compatibility with polymers. This study presents a method of 3D printing PU scaffolds coated with PDA and graphene for enhanced UV stability. The scaffolds were characterized through X-ray diffraction, Fourier-transform infrared spectroscopy, mechanical testing, scanning electron microscopy, and UV durability tests. Results showed successful PDA coating, graphene deposition, and improved mechanical properties. The PDA–graphene-modified scaffolds exhibited greater UV resistance over time, attributed to synergistic effects between PDA and graphene. These findings highlight the potential of combining PDA and graphene to enhance the stability and mechanical performance of 3D-printed PU scaffolds. [ABSTRACT FROM AUTHOR]

High-viscosity asphalt binder is a key material for porous asphalt pavement, but its susceptibility to aging limits its applications. Three recycled-based high-viscosity binders (RHBs), including RH-1, RH-2, and RH-3, were prepared by recycled rubber powder (RRP), recycled polyethylene (RPE), and waste vegetable oil (WVO), and compared with SINO TAFPACK-SUPER (SINO-TPS) high-viscosity asphalt (THA). The feasibility of recycling waste to prepare high-viscosity asphalt was verified by viscosity test, storage stability test, and thermogravimetric (TG) test. The rheological properties and aging resistance of binders were investigated by dynamic shear rheometer (DSR), bending beam rheometer (BBR), Fourier transform infrared (FTIR) spectrometer, and gel permeation chromatography (GPC). The results showed that the storage stability of RHBs is close to that of THA, and the viscosity is higher than that of THA but meets the specification requirements of high-viscosity asphalt binder. In addition, RRP/RPE can improve the high-temperature performance of the binder, and the addition of RRP/WVO can reduce the negative effect of low-temperature cracking of RPE. According to the changes of functional group index and binder molecular size in different aging states, ternary recycling waste can significantly improve the aging resistance of binders. The findings in this work contribute to reducing waste pollution and provides a method for high-viscosity asphalt binder production. [ABSTRACT FROM AUTHOR]

Asphalt binder aging is a complex phenomenon that plays an essential role in reducing flexible pavement serviceability. The aging resistance of asphalt binder can be enhanced through the binder modification. This research investigates the impact of aging on unmodified and organo-montmorillonite (OMMT) nanoclay modified asphalt binders. In this study, laboratory aging is carried out for asphalt binders modified with two types of OMMT nanoclays at different dosages (2% and 4% by weight of the binder). The asphalt binders are subjected to short-term and long-term aging using a rolling thin-film oven and pressure aging vessel equipment. Rheological properties of the aged and unaged binders are determined using a dynamic shear rheometer. In addition, storage stability, full performance grading, and rutting resistance of the binders are evaluated and compared. Aging indices were calculated to investigate the aging behavior of the unmodified and modified binders. The results showed that the montmorillonite nanoclay-modified asphalts had improved resistance to aging compared with the unmodified binder. [ABSTRACT FROM AUTHOR]

Zirconia materials are commonly utilized in biomedical applications due to their esthetic appearance, mechanical properties, and biocompatibility. In this study, composites of 12 mol% Ce-TZP reinforced with a total of 25 vol% alumina and in situ formed manganese cerium hexaaluminate MnCeAl 11 O 19 were produced by a mixing and milling method, shaped by slip casting and pressureless sintered in air at 1500–1550 °C. Microstructure, mechanical properties, phase composition, and low temperature degradation resistance (LTD) were determined. Plain alumina toughened zirconia and a mixed composition containing 15% MnCeA6 combined the highest bending strength of > 650 MPa and highest fracture toughness of 11 MPa√ m. Balancing of contributions by different toughening effects assumes an underestimation of the transformation toughening effect. Evidence of a net synergetic effect between hexaaluminate reinforcement and transformation toughening was not observed. High amounts of manganese cerium hexaaluminate platelets lead to a substantial reduction in mechanical properties. [ABSTRACT FROM AUTHOR]

In order to improve the aging resistance of non--asbestos gaskets, the non--asbestos gaskets was prepared with by beater-addition process by adding hydroxylated multi-walled carbon nanotubes. The compression rate, rebound rate and tensile strength of the gaskets before and after aging were tested with artificial aging tests. The effect of hydroxylated multi-walled carbon nanotubes on the aging resistance of non-asbestos gaskets was explored. The results show that adding hydroxylated multi-walled carbon nanotubes to the non-asbestos gasket formula can reduce the changes in compression, resilience, and tensile strength of the gasket samples before and after aging. As the mass fraction of hydroxylated multi walled carbon nanotubes increases, the performance changes of the gasket before and after aging first decrease and then increase. When the mass fraction of hydroxylated multi--walled carbon nanotubes in the gasket formulation is 1. 2%, the aging resistance of non--asbestos gaskets is significantly enhanced and there is an enhancement of mechanical properties. [ABSTRACT FROM AUTHOR]

Copyright of Plastics Science & Technology / Suliao Ke-Ji is the property of Plastics Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Nano-modified insulating paper, due to its outstanding performance, is regarded as a promising material in power system. Accordingly, in this study, three different kinds of polysilsesquioxane (POSS) nanoparticles were prepared from silsesquioxane monomers with octaaminophenyl, octaphenyl, or octamethyl substituents and used to prepare modified cellulose insulating paper. Doping with the POSS nanoparticles effectively improved the tensile strength of the insulating paper and reduced its relative dielectric constant. Specifically, doping with octaaminophenyl-POSS (OAPS) nanoparticles at 10 wt% showed the optimal modification effect. Accelerated thermal aging was carried out on this OAPS-modified insulating paper. Compared with those of the unmodified sample, the tensile strength of the modified sample was 16.87% higher and the relative dielectric constant was 24.63% lower after aging at 130 °C for 31 days. Molecular dynamics simulation was used to study the mechanism by which OAPS improves the tensile strength, dielectric properties, and thermal stability of cellulose insulating paper, and the results indicated that it forms hydrogen bonds with the cellulose chains, inhibiting their movement and inhibiting system polarizability. [ABSTRACT FROM AUTHOR]

The effect of dicumyl peroxide(DCP), di-tert-butylperoxyisopropyl benzene (BIPB) and 2,5-dimethyl-2,5-di-tert-butylperoxy hexane（DHBP） on properties of hydrogenated nitrile rubber（HNBR）were investigated. The results showed that, in the case of decomposing the same number of free radicals, the compound from DCP had the lowest Mooney viscosity increment, the shortest scorch time, the fastest curing speed, the worst tensile strength and the best hot air aging resistance. The compound from DHBP had the longest scorch time, the slowest cu-ring rate, the lowest hardness and modulus, the hi-ghest tensile strength and elongation at break, the worst compression set and oil resistance. The scorch time, curing speed and tensile strength of the compound from BIPB were in the middle of the first two, with the minimum compression set and worst hot air aging resistance, the Mooney viscosity increment was equivalent to that from DHBP, and other physical and mechanical properties and oil resistance were equivalent to that from DCP.

Shape memory polymers (SMPs) with intelligent deformability have shown great potential in the field of aerospace, and the research on their adaptability to space environments has far-reaching significance. Chemically cross-linked cyanate-based SMPs (SMCR) with excellent resistance to vacuum thermal cycling were obtained by adding polyethylene glycol (PEG) with linear polymer chains to the cyanate cross-linked network. The low reactivity of PEG overcame the shortcomings of high brittleness and poor deformability while endowing cyanate resin with excellent shape memory properties. The SMCR with a glass transition temperature of 205.8 °C exhibited good stability after vacuum thermal cycling. The SMCR maintained a stable morphology and chemical composition after repeated high–low temperature cycle treatments. The SMCR matrix was purified by vacuum thermal cycling, which resulted in an increase in its initial thermal decomposition temperature by 10–17 °C. The continuous vacuum high and low temperature relaxation of the vacuum thermal cycling increased the cross-linking degree of the SMCR, which improved the mechanical properties and thermodynamic properties of SMCR: the tensile strength of SMCR was increased by about 14.5%, the average elastic modulus was greater than 1.83 GPa, and the glass transition temperature increased by 5–10 °C. Furthermore, the shape memory properties of SMCR after vacuum thermal cycling treatment were well maintained due to the stable triazine ring formed by the cross-linking of cyanate resin. This revealed that our developed SMCR had good resistance to vacuum thermal cycling and thus may be a good candidate for aerospace engineering. [ABSTRACT FROM AUTHOR]

Slightly SBS-modified bitumen binders have been applied for the asphalt concrete impermeable layer of pumped storage power stations (PSPSs) in China. However, the storage stability and aging resistance of slightly SBS-modified bitumen are big concerns. In this study, three different types of slightly SBS-modified bitumen binders were evaluated by using a commonly used virgin bitumen and a normal SBS polymer-modified bitumen as references. All of the bitumen binders were subjected to short-term and long-term aging that were simulated by using a 5 h and 24 h thin film oven test (TFOT), respectively. A Fourier transform infrared (FTIR) spectroscopy test, storage stability test, dynamic shear rheological test, stress relaxation test, and direct tensile (DT) test were carried out to obtain insight into the storage stability and aging resistance. FTIR analysis indicated that slightly SBS modified bitumen exhibited serious aging of base bitumen together with higher polymer degradation. The aging indexes obtained from the carbonyl index and the polybutadiene (PB) index can well rank the aging resistance. Slightly SBS-modified bitumen binders had excellent storage stability, and even after a long-term period of 7 days of storage, the complex modulus and phase angle remained fairly constant. The rheological master curves were constructed to investigate the effects of short-term and long-term aging. Slightly modified bitumen binders were well identified by the plateau of the phase angle master curves. The aging resistance was well distinguished by the deviation of the complex modulus master curve using unaged bitumen as a baseline. It was found that three types of slightly SBS-modified bitumen binders exhibited inconsistent aging resistance in terms of rheological aging index. The relative change of the initial instantaneous modulus and the modulus relaxation rate was able to explain the relaxation properties. With respect to the direct tensile test, the increase in stiffness modulus and the loss of ultimate tensile strain can be used to evaluate the susceptibility of bitumen aging. An attempt was made to establish the relationship of the aging index between FTIR analysis, rheological properties, and low-temperature performance. It was found that the relationship among these aging indexes was weak. In general, slightly SBS modified bitumen should be well designed to obtain good aging resistance and low-temperature performance. Highly modified bitumen is foreseen to be promising in the case of extremely low temperatures and long-term durability. [ABSTRACT FROM AUTHOR]

In this study, asphalt binders were modified with polymeric triethylene glycol-based polyboron (PTEGB) and organic-based magnesium oxide (OBMO) at different concentrations. The materials used as additives were synthesized under our laboratory conditions. All modified and unmodified binders were aged by Thin Film Oven Test. (TFOT). The modified and unmodified asphalt binders firstly were evaluated by viscosity aging index obtained from a rotational viscometer. Then, all aged binders were subjected to Fourier transform infrared spectroscopy for obtaining the degree of oxidation. Also, the physical properties of the PTEGB and the OBMO-modified asphalt binders were detected through traditional tests. Marshall stability test was also applied to all aged and non-aged asphalt mixtures to understand mechanical performance and aging effects of the additives on asphalt mixtures. As a result, the optimum PTEGB percentage has been obtained as 2% (w/w), and the optimum OBMO percentage has been obtained as 1% (w/w) according to the aging indexes. The PTEGB and the OBMO additives decreased the TFOT aging of asphalts by 56.7% and 50.6%, respectively. It was also found out that the Marshall stability value of the hot mix asphalt decreased by 23% with the TFOT aging of the original asphalt binder. However, the same value was found as 7% at the OBMO-modified asphalt binder and 8.8% at the PTEGB-modified asphalt binder. [ABSTRACT FROM AUTHOR]

Polyurethane-based solid–solid phase change materials have great potential as thermal energy storage materials for cooling utilizations in asphalt mastic. The major goal of the present work is to evaluate the adhesion, rheology and temperature-adjusting performance of the phase change heat storage asphalt mastics subjected to laboratory aging. For this purpose, the binder bond strength test, dynamic shear rheological test, multiple stress creep and recovery test and temperature regulation test were conducted on the mastic samples, and the test results were further statistically analyzed. It is demonstrated that irrespective of the aging level, the phase change asphalt mastics exhibit significantly decreased adhesive property, stiffness and viscous response, whereas improved elastic recovery ability and permanent deformation resistance compared to the corresponding conventional asphalt mastic. For phase change asphalt mastics, the dosage of phase change material has a statistically significant effect on the rheological and anti-aging properties except for adhesive property. The temperature rising rate of phase change asphalt mastics are slower than that of the conventional counterpart, and aging has little effect on the cooling performance of phase change asphalt mastics. [ABSTRACT FROM AUTHOR]

Fine art coating is usually created by the combination of metal filler and water-based coatings, decorated to the surface of wood structures, furniture, and crafts. However, the durability of the fine art coating is limited by its weak mechanical qualities. In contrast, the metal filler's dispersion and the coating's mechanical properties can be significantly improved by the coupling agent molecule's ability to bind the resin matrix with the metal filler. In this study, a brass powder-water-based acrylic coating was prepared, and three different silane coupling agents, 3-aminopropyltriethoxysilane (KH550), γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH560), and γ-methacryloxypropyltrimethoxysilane (KH570), were used to modify the brass powder filler in orthogonal tests. The artistic effect and optical properties of the modified art coating induced by different proportions of brass powder, silane coupling agents, and pH were compared. The result demonstrated that the amount of brass powder and the kind of coupling agent used had a substantial impact on the coating's optical characteristics. Our results also determined how three different coupling agents affected the water-based coating with varying brass powder contents. The findings indicated that 6% KH570 concentration and pH 5.0 were the ideal conditions for brass powder modification. Better overall performance of the art coating applied to the surface of the Basswood substrates was provided by adding 10% of the modified brass powder into the finish. It had a gloss of 20.0 GU, a color difference of 3.12, a color main wavelength of 590 nm, a hardness of HB, an impact resistance of 4 kg·cm, an adhesion of grade 1, and better liquid resistance and aging resistance. This technical foundation for the creation of wood art coatings promotes the application of art coatings on wood. [ABSTRACT FROM AUTHOR]

The effects of N‐isopropyl‐N′‐phenyl‐phenylenediamine (4010NA) content on the damping and aging properties of hydrogenated nitrile butadiene rubber (HNBR)/nitrile butadiene rubber (NBR) (abbreviated as H‐NBR) matrix are studied via molecular simulation and experiments. The effects of 4010NA addition on the damping and aging properties of H‐NBR are analyzed by molecular simulation using solubility parameters (δ), hydrogen bonds, free volume fraction (FFV), binding energy (Ebinding), hydrogen bond dissociation energy (ΔG), and mean square displacement (MSD). The damping, mechanical, and thermo‐oxygen aging properties of the 4010NA/H‐NBR composites are studied experimentally using infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). The results indicate that 4010NA has good compatibility with HNBR and NBR, and the addition of 4010NA can effectively improve the damping properties of H‐NBR. When 4010NA is added at 32 phr, the composite has better damping properties, mechanical properties, and aging resistance, which provides a new insight for the construction of high performance elastomer composites. [ABSTRACT FROM AUTHOR]