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Copyright of China Fiber Inspection / Zhongguo Xian-Jian is the property of China Fiber Inspection 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 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.)

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals 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.)

Objective To investigate the effects of polybutylene terephthalate(PBT) grafted with various monomers, such as acrylic acid(AA), acrylamide(AM), sodium styrene sulfonate(SSS), AA+ AM and AA+ SSS on platelet adhesion and function. Methods The AA, AM, SSS, AA+ AM, and AA+ SSS were grafted onto the surface of PBT by γ-ray irradiation, and the grafted PBT was characterized by fourier transform infrared spectrometry(FTIR) and wetting time. Platelet activation and aggregation of different monomers grafted with PBT were observed by scanning electron microscopy(SEM). Platelet concentration, maximum aggregation ability, positive expression rate of CD62p and hypotonic shock rate(HSR)of PBT grafted with different monomers were tested to study their effect on platelet adhesion and function. Results The characteristic absorption peaks of AA, AM and SSS appeared in FTIR, and the hydrophilicity of the grafted material was improved obviously, indicating that the monomer was grafted successfully. The results of SEM showed that the degree of platelet activation and aggregation caused by the original PBT was significantly higher than that of modified ones. Compared with the original platelets, the platelet concentration of PBT was(533.00±4.58 vs 672.00±3.61)×109/L, the maximum platelet aggregation rate was(48.80±0.96 vs 58.60±1.37)%, the positive expression rate of CD62p was(45.35±0.58 vs 39.90±0.52)%, and the platelet HSR was(48.74±0.46 vs 51.86±0.93)%(P

Copyright of Food & Fermentation Industries is the property of Food & Fermentation Industries 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 polymer of sodium lignosulfonate and acrylic acid was prepared by grafting copolymerization, and lignin hydrogel was obtained by the polymer intercalated with montmorillonite, and the adsorption performance of Zn (II) by lignin hydrogel was investigated. The results showed that the prepared hydrogels have good adsorbability of Zn (II) and pH response. The adsorption capacity reached 285.39 mg/g, under the initial solution concentration of 600 mg/L, pH =4.5, adsorption temperature of 45 °C and adsorption time of 140 min, respectively. Modeling of adsorption kinetics indicated good agreement of experimental data with the quasi-second-order kinetic model. Langmuir equilibrium isotherm fitted the experimental data reasonable well, the adsorption is monolayer adsorption. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department 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.)

Xylan-based hydrogels were prepared by the crosslinking copolymerization of xylan with acrylic acid and Nisopropylacrylamide using N,N´-methylenebis-acrylamide as a cross-linker. The structure of the xylan-based hydrogel was analyzed by FTIR and the effects of pH value, adsorbent dosage, initial mass concentration of the methylene blue, and contacting time on adsorption capacities of methylene blue were studied. The results showed that the optimal pH value range for removing methylene blue by hydrogel was 3~6, and the adsorption equilibrium time was about 150 min. The xylan-based hydrogel had good adsorption performance for methylene blue, and its adsorption removal rate for methylene blue solution (≤600 mg/L) was as high as 97% . The adsorption behavior of methylene blue on hydrogels was in accordance with the pseudo-second order kinetic model and Langmuir isothermal adsorption model. According to the Langmuir adsorption model, the maximum adsorption capacity can reach 1 094 mg/g. The xylan-based hydrogel showed good performance of regeneration and reuse, and can be used as biomass adsorbent for methylene blue wastewater treatment. [ABSTRACT FROM AUTHOR]

At present, conventional smooth hydraulic fracturing fluid systems generally have various functions such as drag reduction, sand carrying, salt resistance, and temperature resistance, but none of them have considered achieving reservoir protection by changing the surface wettability of the reservoir. Therefore, in this paper, a superhydrophobic multifunctional fracturing fluid drag reducing agent, named SHJZ-1, was synthesized using acrylic acid, acrylamide, self-made material 2-acrylamido-2- phenylethanesulfonic acid, and hydrophobic modifier as raw materials. The structure of the synthesized drag reducing agent was characterized by infrared spectroscopy, and its performance was comprehensively evaluated through various methods such as hightemperature and high-pressure core dynamic damage evaluation system, contact angle measurement instrument, Hack rheometer, and closed pipeline friction tester. The results show that the drag reducing agent SHJZ-1 had a short dissolution time and rapid adhesion. When the salinity of saline water reaches 40000 mg/L, the drag reduction rate of 0.5% SHJZ-1 solution was about 68%. The 0.15% SHJZ-1 solution can still achieve a drag reduction rate of over 70% after high-temperature aging at 140 ℃. Furthermore, the core treated with 1.3% SHJZ-1 solution exhibited superhydrophobic effect, with a core contact angle of 151.21°. Additionally, the average permeability damage rate of the core caused by this drag reducing agent solution was only 11.6%. The super hydrophobic multifunctional smooth hydraulic fracturing fluid system has been successfully applied on site in the HX-1 well. In fracturing engineering, the performance of smooth hydraulic fracturing fluid is relatively stable, and the production after fracturing is increased by more than 10% compared to the adjacent well. The effect is significant, achieving the goal of improving quality and efficiency. [ABSTRACT FROM AUTHOR]

Copyright of Journal of South China Normal University (Natural Science Edition) / Huanan Shifan Daxue Xuebao (Ziran Kexue Ban) is the property of Journal of South China Normal University (Natural Science Edition) 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 Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology 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 Journal of Dalian Polytechnic University is the property of Journal of Dalian Polytechnic University Editorial Department 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 Electroplating & Finishing is the property of Electroplating & Finishing 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.)

Wood chip pyrolysis oil was used as raw material, and the pretreated bio-oil was polymerized with acrylic acid (AA) and chitosan (CTS) in the presence of ammonium persulfate (APS). A new bio-oil-based environmentally friendly coal dust inhibitor(Hbio-CTS) was prepared. The results show that at 70 °C, CTS and AA mass is 0.65 g and 3.00 g, when APS/CTS is 5%, the maximum viscosity of Hbio-CTS synthesized under optimized conditions is 5.4 mPa ⋅ s. Both the FTIR and TG properties of Hbio-CTS confirmed that AA and CTS had been successfully grafted on the structure of bio-oil components. The solidified layer formed by Hbio-CTS on pulverized coal is very little affected by wind and rain. Among them, at 17 m/s(class VII), the maximum mass loss of pulverized coal was 6.99%. After 8 cycles(56 d), the degradation rate of Hbio-CTS was 57%. [ABSTRACT FROM AUTHOR]

Fatty alcohol polyoxyethylene ether acrylate was synthesized directly from fatty alcohol polyoxy-ethylene ether and acrylic acid by esterification reaction, using p-toluenesulfonic acid as catalyst and hydroquinone as polymerization inhibitor. The effects of reactant feeding ratio, catalyst dosage, catalyst type, reaction temperature and reaction time on the esterification reaction were investigated. The results showed that the suitable synthesis process conditions were : n (aliphatic alcohol ethoxylate) : n (acrylic acid) = 1: 3, the amount of catalystp-toluenesulfonic acid was 1% (mass fraction of aliphatic alcohol ethoxylate), the reaction temperature was 120 °C, the reaction time was 3 h, and the amount of resorcinol was 0.05% (mass fraction of acrylic acid). Under the above conditions, the conversion of the esterification reaction could reach 90.70%. [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.)

The organosilicon terpolymer scale inhibitor (EAVT) was synthesized by copolymerization of epoxy succinic acid, vinyl triethoxysilane and acrylic acid as starting materials and azobisisobutyronitrile as initiator. The influence of polymerization conditions on the performance of EAVT calcium scale inhibition was explored, and the performance of EAVT on single scale and composite scale was evaluated. The results show that the optimal synthesis conditions are that under the temperature of 65, 4 hours, 6 wt% of initiator, and the ratio of 0. 810. 8(epoxy succinic acid, acrylic acid, and vinyl triethoxysilane). When EAVT is 100 mg/ L, its scale inhibition rates for calcium magnesium scale and barium strontium scale in the formation water of a certain oilfield are 88. 28% and 87. 26%, respectively. [ABSTRACT FROM AUTHOR]

The viscosity-reducing polycarboxylic acid superplasticizer PCZ-100 was synthesized from the copolymerization of methacrylate block polyether (JHE-220), acrylic acid (AA) and sodium methylallyl sulfonate (SMAS). The effects of monomer molar ratio, reaction temperature, amount of chain transfer agent and amount of initiator on the properties of superplasticizer were studied, and the effects of different ratios of viscose-reducing carboxylic acid and water-reducing carboxylic acid on the properties of concrete were tested. The results show that the optimum synthesis conditions of PCZ-100 are as follows: n (JHE-220) :n (AA) :n (SMAS)=1.0:3.5:0.3, the amount of chain transfer agent was 1.7% of the total weight of monomer, the amount of initiator was 1.2% of the total weight of monomer, the reaction temperature is 65~70 °C. The superplasticizer synthesized by the above formula and process can better reduce the viscosity of concrete and obviously improve the strength of concrete. [ABSTRACT FROM AUTHOR]

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute 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 copolymer of deproteinized natural rubber (DPNR) grafted acrylonitrile (AN) and acrylic acid (AA) [DPNR-g-P(AN-co-AA)] was synthesized by emulsion grafting copolymerization, using DPNR as matrix, AN and AA as monomers in the initiation system of tert-butyl hydroperoxide and tetra-ethylenepentamine. The grafting of AN and AA monomers was verified by infrared spectroscopy and nuclear magnetic resonance spectroscopy, and the effects of total monomers amount and m(AN) / m(AA) on the mechanical properties of modified DPNR were studied, as well as the effect of healing conditions on its self-healing property. The results showed that under the conditions of a total monomer amount of 10 phr (in terms of dry rubber mass) and m(AN) / m(AA) of 10/1, the maximum tensile strength and elongation at break of DPNR-g-P(AN-co-AA) were 9.22 MPa and 1 365%, respectively, which were 376% and 133% of the initial DPNR. In addition, the hydrogen bond interaction between polyacrylic acid segments in the system enabled DPNR-g-P(AN-co-AA) to have excellent self-healing property, reaching a self-healing efficiency of 75.3% after 2 h of healing at 50 ℃. "

Synergistic therapeutic effect through the intracellular co-delivery of chemotherapy and biomacromolecule drugs is a novel strategy for improving tumor treatment effectiveness. A triblock copolymer, poly(acrylic acid)-poly(N, Ndiisopropylaminoethyl methacrylate)-poly(N-vinylcaprolactam) (PAA-PDPA-PNVCL), was designed and synthesized for the construction of smart responsive drug carriers. The structure of the polymers was verified by nuclear magnetic resonance spectroscopy (¹H-NMR) and fluorescence spectrophotometer (FL). The transmittances of the polymer solutions under different pH values or temperatures were measured by ultraviolet-visible spectroscopy (UV-Vis). Results showed that the polymer had excellent pH responsiveness and a low critical solution temperature (LCST), which could self-assemble into vesicles with PAA as hydrophilic shell, PDPA as hydrophobic intermediate layer and PNVCL as hydrophilic cavity. Then, the PAA shell layer was crosslinked with disulfide bonds through amide reaction, to improve the structural stability of vesicles and meanwhile introduce the reduction sensitivity. The changes of the particle size, Zeta potential, and morphology of the vesicle under different conditions were studied by dynamic light scattering (DLS) and transmission electron microscopy (TEM). Results showed that the shell-crosslinked vesicles were uniformly sized spherical structure with good pH value and reduction responsiveness. Their drug encapsulation effect and in-vitro release behavior under different pH values and glutathione (GSH) concentrations were studied by UV-Vis and FT-IR. Results showed that the carriers could achieve zoned and co-loading of hydrophobic small molecule drug (doxorubicin (DOX)) and hydrophilic macromolecular protein drug model (bovine serum protein (BSA)). The hydrophobic layer of PDPA and the crosslinked layer of PAA provided dualblockade for drug leakage. The leakage of drugs under normal physiological conditions was low, and the release of DOX and BSA could only be triggered under simulated tumor microenvironment, that is, weak acid and high concentration of GSH conditions. The smart responsive drug carriers constructed in this paper are expected to achieve co-delivery of chemotherapy and biomacromolecule drugs, which have potential application value to the clinical treatment of tumors. [ABSTRACT FROM AUTHOR]

Objective To explore the effects of new composite hydrogel on the physiological characteristics of tobacco seedlings under drought stress, and to provide theoretical basis for alleviating the toxicity of drought stress to tobacco. Method A total of 10 treatments including CK control and three different hydrogels added at 0.1%, 0.5% and 0.9% of soil dry mass: commercial hydrogel HS, new composite hydrogel HM (polyvinyl alcohol-acrylic acid-molecular sieve hydrogel) and HB (polyvinyl alcohol-acrylic acid-biochar hydrogel) were designed by pot experiment to study the effects of new composite hydrogels on tobacco under drought stress The effects of the new composite hydrogels on biomass accumulation, root development, photosynthetic system and oxidative stress of tobacco under drought stress were investigated. Result Under the same dosage conditions, HM and HB treatments were effective in increasing the fresh mass, dry mass and total water content of tobacco under drought stress compared to HS treatment. Compared with CK, HM and HB treatments could increase the fresh mass by a maximum of 153.91% and 126.34%, respectively. Under the same dosage conditions, HM and HB treatments significantly increased the total root length, total root surface area, average root diameter, root tip number and root volume, and improved the root vigor of tobacco compared with HS treatments; photosynthetic parameters and SPAD values of tobacco increased significantly and improved leaf stomatal status; SOD (superoxide dismutase), POD (peroxidase) and CAT (catalase) activities and soluble protein amounts of tobacco increased and MDA (malondialdehyde) amounts decreased significantly, which enhanced the resistance of tobacco. Conclusion Adding 0.9% HM and HB hydrogels to soil dry weight can effectively reduce the impact of drought stress on tobacco and improve tobacco drought resistance. [ABSTRACT FROM AUTHOR]

Copyright of Oilfield Chemistry is the property of Sichuan University, Oilfield Chemistry 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.)

EPEG-Based mud-resisitant polycarboxylate superplasticizer PCE-ES and PCE-ESD were synthesized by aqueous free radical polymerization reaction of a new type of macromonomer ethylene glycol monovinyl polyethylene glycol ether" EPEG), acrylic acid ( AA), sodium methacrylate sulfonate" SMAS) and acryloyloxyethyl trimetliyl ammonium chloride ( DAC ) as macromonomer, and the structure of the target product was analyzed and characterized by FTIR and 1H NMR, the mud resistance of the water reducing agent was tested by the net cement slurry flow rate, and the mechanism of the interaction between different water reducing agents and montmorillonite and cement was investigated by XRD and XPS. The results show that when the water reducing agent is 0. 25 by mass of cement and 3 by mass of montmo- rillonite, PCE-ES and PCE-ESD have certain mud resistance, and PCE-ESD has better mud resistance; the XRD results showed that the layer spacing of PCE-ES and PCE-ESD adsorbed by montmorillonite did not change much, indicating that the negative effect of montmorillonite on water reducing agent was reduced to some extent,thus improving the dispersing ability of water reducing agent on cement. [ABSTRACT FROM AUTHOR]

A nonionic polymer thickener ( EOAP) was synthesized from fatty alcohol polyoxyethylene ether and acrylic acid, the structure of EOAP was characterized, its surface properties and application properties were tested, and finaHy the thickening effect of EOAP on standard laundry detergent and sodium lauryl benzene sulfonate ( LAS) was studied. The results showed that EOAP had high surface activity, cmc is 39. 7 mg/L and ycmc is 34. 6 mN/m. Compared with the nonionic surfactant AEO9,the application performance of EOAP is not significantly weakened. Under the premise of ensuring the excellent performance of the main surfactant,5 EOAP was added to the standard laundry detergent and LAS aqueous solution,the viscosity of the former increased by 35 times,and the viscosity of the later also increased to the viscosity of standard dishwashing detergent. [ABSTRACT FROM AUTHOR]

Copyright of Electroplating & Finishing is the property of Electroplating & Finishing 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.)

Bovine serum albumin (BSA) molecularly imprinted polymer (MIP) surface plasmon resonance (SPR) biosensors were prepared using BSA as the model, dopamine as the functional monomer and cross-linker and sodium periodate as the oxidant. BSA molecules were fixed in advance through hydrogen bond via introducing poly(acrylic acid) (PAA) to increase recognition sites, and partially hydrolyzed poly(2-methyl-2-oxazoline)(PMOXA-EI) was also introduced into the noncavity regions of polydopamine to resist nonspecific adsorption of proteins. The prepared BSA-MIP SPR sensor was characterized by X-ray photoelectron spectroscopy, atomic force microscopy, variable angle spectroscopic ellipsometry, and static water contact angle. SPR adsorption studies were carried out in aqueous BSA solutions with the mass concentration of 0.1 — 10 μg/mL. The limit of detection and the limit of quantification values were obtained as 53 ng/mL and 161 ng/mL, respectively. Selectivity studies were performed against β-lactoglobulin, ovalbumin, lysozyme, and cytochrome C, and the corresponding selectivity coefficients were determined to be 4.43, 3.45, 3.17 and 3.64, respectively. Finally, BSA-MIP biosensor was used to detect BSA in the mixture solution of the above five proteins. The BSA recovery rate was 97.5%—102.5%. [ABSTRACT FROM AUTHOR]

Taking the block polyether which made from ethylene oxide/propylene oxide, and acrylic acid as the main polymerization monomer, and then acrylamide containing amide groups, and 2-acrylamide-2-methylpropane sulfonic acid were selected as functional monomers to produce early-strength polycarboxylate superplasticizer under normal temperature and pressure. The effects of different amounts of acrylic acid, redox system, chain transfer agent, reaction temperature and other factors on the products performance were investigated. The results showed that the early-strength performance of the superplasticizer was outstanding under the reaction conditions of n (polyether monomer) :n (acrylic acid) :n (acrylamide) =1:8:0.24, H2O2/ascorbic acid redox system at 40 °C. When the cement content of superplasticizer is 0.28% of the cement content, compared with conventional polycarboxylic acid superplasticizer, the 1 d and 3d compressive strength of the superplasticizer which containing acylamide group could be increased by 18.5% and 17.8% respectively. The initial and final setting time were reduced by 53% and 35% respectively. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Northeast Petroleum University is the property of Journal of Northeast Petroleum University 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 Transactions of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher 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 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.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department 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.)

A new type of high activity EPEG monomer was selected to react with acrylic acid, hydroxyethyl ester and other small monomers. The optimal process for synthesizing anti mud and slump retention polycarboxylate superplasticizer was determined through orthogonal experiment and single factor influence experiments as follows: Acid-ether ratio 2.0, ester-ether ratio 2.6, dropping time material A 40 min, material B 50min, reaction process without temperature control, primer concentration 60%, reducing agent dosage 0.23%, chain transfer agent dosage 0.69%, terminating phosphate ester dosage 4.30%. The test results of cement paste and concrete show that the synthesized polycarboxylate superplasticizer has good dispersibility and slump retention, and has no adverse effect on the strength of concrete. [ABSTRACT FROM AUTHOR]

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department 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.)

A super absorbent polymer (SAP) was prepared using starch and acrylic acid under exposure to 60Co γ-rays irradiation. The chemical structure of the SAP was characterized by Fourier-transform infrared spectroscopy Scanning electron micrographs showed that the surface of the SAP contained numerous mesoporous structures. Thermogravimetric analysis indicated improved thermal stability of the SAP compared to that of the original starch. The absorbed dose and feed ratio of the acrylic acid and starch significantly affected the water absorption performance of the SAP. The water absorption capacity of the SAP was 532 g/g at the optimal conditions (absorbed dose: 20 kGy, crosslinking agent: 80 mg/L, feed ratio of starch to acrylic acid: 1/2). The SAP efficiently released the loaded KNO3 or Na3PO4; the release rates were 82% for K+ and 80% for PO43-.

Choosing liquid-phase product from alkali oxidization of coal tar pitch, acrylamide, polyethylene glycol and acrylic acid as raw material, with ammonium persulfate as the initiator, N,N’-methylenebisacrylamide as the crosslinking agent, salt resistant coal bitumen based absorbent resin with good resistance to salt and high water absorption capacity was prepared by aqueous solution polymerization method.The optimum synthesis conditions were as follows: P∶AA∶AM∶PEG∶APS∶MBA=1.2∶2∶0.2∶1.2∶0.06∶0.04,polymerization temperature 80 ℃,particle size 0.15～0.30 mm.The water absorption rate of the synthesized resin was 451.8 g/g in aqueous solution and 115.7 g/g in normal saline.The optimum synthesis conditions were determined by single factor and orthogonal analysis.The structure was characterized by infrared spectroscopy and scanning electron microscopy. [ABSTRACT FROM AUTHOR]

A composite aerogel was successfully prepared by using graphene oxide and esterified starch as the matrix and acrylic acid as crosslinking agent, and the adsorption properties of Pb2+ were explored.The structure and morphology of the material were characterized by XRD,FTIR and SEM,and the effect of different conditions on the adsorption of metal ions on the composite aerogel was explored by detecting the concentration of metal ions by inductively coupled plasma emission spectroscopy.The results show that the composite aerogel has a three-dimensional structure and porous structure, providing good conditions for adsorbing metal ions.When mass ratio of starch, acrylic acid and GO was 1∶1∶0.02,and pH was about 4.6,the adsorption performance of esterified starch/acrylic acid/graphene oxide composite aerogel for Pb2+ was the best, and the adsorption reached the adsorption equilibrium for 6 h, the maximum adsorption capacity is 510.65 mg/g. [ABSTRACT FROM AUTHOR]

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher 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.)

In the precision machining of iron and steel parts, optical glass and battery materials, it is difficult to clean the superfine powder adsorbed on the surface in time and effectively. A water-soluble acrylic acid copolymer(DM-AA) dispersant was synthesized from maleic anhydride, n-butanol and acrylic acid. The effects of different ratio, amount of initiator and temperature on the dispersing properties of hyperdispersant were studied. The result showed that the optimum reaction conditions were determined: Reaction temperature 80 ℃, material ratio of dibutyl maleate to acrylic acid 1: 1. 5, the dosage of initiator was 2.2 g. DM-AA was characterized by mean of IR. The relative molecular weight of the product was 15 973.5. When the mass fraction of DM-AA was 2.3%, the dispersing effect tended to be stable and reached a high level, and the scale inhibition performance of the dispersant was tested, when the addition of DM-AA reached 10 mg/L, the scale inhibition effect reached the best state. [ABSTRACT FROM AUTHOR]

The tight oil reservoir of Daniudi gas field in northern Hubei block has small pore throat and low temperature, which puts forward higher requirements for the application of temporary plugging agent. Based on the optimization of acrylamide, acrylic acid, potassium bisulfite and other raw materials, a new type of low-temperature temporary plugging agent was prepared by means of the temperatures-pressure control monomer and the polymerization of the monomer, and its solubility and comprehensive performance were evaluated. The results showed that the optimal ratio of acrylic acid to acrylamide was 0. 62, and the optimal polymerization time was 1.83 h. When the temperature is 30-40 °C, the flow viscosity after degradation of the low-temperature temporary plugging agent is less than 5.21 mPa·s, and when the dissolution time is 2.5 h at 40 °C, the degradation rate of the temporary plugging agent is more than 80%. When the thickness of the temporary plugging agent is 3 cm, the maximum pressure required to break through the temporary plugging slug is 60. 12 MPa, and when the thickness of the temporary plugging agent is 7 cm, the maximum pressure required to break through the temporary plugging slug is 73. 85 MPa. The new low temperature temporary plugging agent has excellent performance and can meet the requirements of temperature, pressure and flow viscosity after degradation in the northern Hubei block. [ABSTRACT FROM AUTHOR]

In order to explore the repair characteristics of polymer modified silica powder mortar, an experimental study was conducted on the compressive, splitting and tensile properties of mortar mixed with acrylic emulsion (10%, 20% and 30%) and silica powder (5% and 10%) and its direct tensile bonding and bending bonding properties so as to provide a basis for the application of high-performance repair materials on concrete surface. The results show that, the addition of acrylic emulsion and silica powder can effectively improve the compressive strength and splitting tensile strength of mortar. When the addition of acrylic emulsion is 30% and the addition of silica powder is 10%, the compressive strength and splitting tensile strength of specimens at 28 d are increased by 15.24% and 46.90% respectively when compared with control samples. The addition of silicone powder and acrylic emulsion can effectively improve the bonding strength of mortar. The direct tensile bonding strength and flexural bonding strength of repair mortar using acrylic emulsion as the binder can reach 3.3-4.2 MPa and 7.5-11.4MPa,respectively. Acrylic emulsion modified silica mortar has excellent tensile and bonding properties and can be used as an ideal repair material for concrete, especially hydraulic concrete. [ABSTRACT FROM AUTHOR]

A chemically cross-linkable molecular self-conjugated polymer, HCG-2， was synthesized from acrylamide， acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, functional monomers containing cross-linking sites, and cetyl dimethyl allyl ammonium chloride， and its synthesis conditions were optimized. The thixotropy and viscoelasticity of HCG-2 were investigated, and it was found that a dynamic structure could be formed between HCG-2 molecules in aqueous solution， and the surfactant sodium dodecyl sulfate could improve the strength of this structure; the relationship between temperature and the thixotropy and viscoelasticity of the system was investigated, and it was found that the interaction between HCG-2 molecular chains under the influence of the surfactant was weak and could not withstand too high temperature However, after using chemical cross-linking agents to form chemical bonds between the molecular chains, the temperature and shear resistance of the system at 180℃ could meet the requirements of the industry standard. [ABSTRACT FROM AUTHOR]

To enhance the comprehensive performance of polyacrylamide-based hydrogel and increase its usability, KH-570 modified nano-SiO2 reinforced polyacrylamide-based gels were investigated， and millimeter-scale modified nano-SiO2 composite polyacrylamide was prepared. Base gel particles. The product was analyzed and characterized by FTIR and confirmed that nano-SiO2 had been successfully modified and copolymerized with acrylamide and acrylic acid to form a copolymer; water absorption, strength, dissolution time and residues of nano-SiO2 composite gel modified with various additions were measured. The results show that when the amount of modified nano-SiO2 is 15%～17%, the water absorption rate and strength of the composite gel particles are greatly improved in each temperature range: The residue after complete dissolution of the gel is nano-SiO2, which is harmless to the environment and is expected to be used in the field of oil extraction to reduce the damage to the environment. [ABSTRACT FROM AUTHOR]

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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.)

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Poly(ESA-AA-SAS-HPA) w a s synthesized by solution polymerization from epoxy succinic acid (ESA), acrylic acid (AA), sodium allyl sulfonate (SAS) and hydroxypropyl acrylate (HPA). It was characterized by FT-IR, ¹H NMR, TG and DLS. The effects of chelating pH, temperature and additive mass fraction on the washing aid performance of Poly(ESA-AA-SAS-HPA) were investigated. The results show that, compared with sodium tripolyphosphate, it has good washing aid performance, with the chelating amount of 308.7 mg/g and the calcium dispersing power of 101.5 mg/g. Poly (ESA-AA-SAS-HPA) has good synergism with sodium dodecylbenzene sulfonate (LAS), which can reduce the surface tension of the system to 45 mN/m. [ABSTRACT FROM AUTHOR]

Copyright of Inorganic Chemicals Industry is the property of Editorial Office of Inorganic Chemicals 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.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology 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 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.)