Search

[Display omitted] • A flame retardant (POSB) containing P and B elements was synthesized. • EP/5 wt% POSB had an LOI value of 32.9 % and passed UL-94V-0 rating. • The heat and smoke production of EP were greatly reduced. • The dielectric constant and dielectric loss of EP composite were decreased. This work presents a novel approach to enhance the flame retardancy and dielectric properties of epoxy resin (EP) through the incorporation of a newly developed flame retardant (POSB) containing phosphorus and borate. The EP composite with only 5 wt% POSB achieves an impressive limiting oxygen index (LOI) of 32.9 % and attains a V-0 rating in the UL-94 test. Cone calorimetry results reveal a substantial reduction of 33.3 % in peak heat release rate (pHRR) and 36.7 % in peak smoke production rate (pSPR) for the EP/POSB sample compared to the control EP sample. The impact of POSB on mechanical and dielectric properties is comprehensively analyzed, demonstrating minimal impact on tensile, impact, and flexural performance, as well as transparency in the EP sample. Notably, the EP/5 wt% POSB composite exhibits significantly decreased dielectric constant and dielectric loss in the frequency range of 103 ∼ 106 Hz. This research introduces a strategy of producing materials for electronic products with simultaneous improvements in flame retardancy, dielectric properties, mechanical performance, and transparency. [ABSTRACT FROM AUTHOR]

[Display omitted] • An eco-friendly coating was prepared by PA-induced polymerization and dipping with AgNWs. • The coated blend fabrics displayed excellent EMI shielding performance. • The coating imparted blend fabrics with antibacterial properties. • The coating maintained a suitable surface temperature for blend fabrics. • The phosphorus-nitrogen synergistic effect improved the flame retardancy of the coating. The functional flexible wearable textiles have a broad application prospect in many areas. However, considering the physical and chemical effects among various additives, it is still a big challenge to prepare wearable fabrics with a balance between different properties. Herein, an eco-friendly and multifunctional nylon/cotton blend fabric was constructed by phytic acid (PA)-induced polymerization of polypyrrole on the surface, followed by dip coating with silver nanowires (AgNWs). A high electrical conductivity of the treated blend fabrics (61 S·m−1) was obtained contributed to the excellent EMI shielding performance of nylon/cotton blend fabric (X-band ∼ 38.8 dB). Meanwhile, the coating maintained the surface temperature of the fabric within a suitable range, resulting in achieving the efficient thermal management. Furthermore, the treated nylon/cotton blends achieved a remarkable reduction (83.3 % and 81.7 %) of peak heat release rate and total smoke production compared to that of the control nylon/cotton blends. In addition, the considerable antibacterial property against E. coli and S. aureus was also realized. The successful application of this simple and eco-friendly method offered the possibility of preparing safer and more versatile wearable smart textiles. [ABSTRACT FROM AUTHOR]

[Display omitted] • Bio-based lentinan (LNT) and ammonium phytate (APA) were introduced onto cotton fabric. • The flame retardancy of cotton fabric was significantly enhanced by the presence of APA and LNT. • The LNT outer layer improved the thermostability, durability, and breaking force of the APA-treated cotton fabric. As the most widely used natural fabric, cotton fabric is highly flammable with serious fire hazard concerns. The use of biomass materials to impart flame resistance to fabrics is always a hot topic of interest. In this work, a novel durable flame retardant cotton fabric (Cotton-APA/LNT) was fabricated by successively covalent bonding ammonium phytate (APA) and lentinan (LNT). The Cotton-APA/LNT fabric sample had a highly limiting oxygen index (LOI) value of 51.5 % and was self-extinguished in the vertical burning test (VBT) at 18.0 % weight gain. The peak heat release rate and total heat release values were decreased by 91.5 % and 46.0 %, respectively compared with those of the control cotton. Besides, after 50 laundering cycles (LCs), the fabric was still self-extinguished in the VBT with an LOI value of 34.2 %. APA fully strengthened the role of acid source by the presence of LNT. The constructed LNT outer layer showed comprehensive improvements in thermostability, flame retardancy, smoke suppression, durability, and breaking force. Specifically, the Cotton-APA/LNT sample had a higher LOI value (↑4.3 %), lower total heat release (↓23.8 %), lower total smoke production (↓29.1 %), higher thermostability (↑27 °C under air), better char formation ability (↑2.0 % under air), higher durability (self-extinguished in the VBT after 50 LCs), and higher breaking force (↑32.5 % in the warp direction and ↑33.9 % in the weft direction) compared with those of Cotton-APA sample. This work has proposed an advanced approach for fabricating eco-friendly durable fire-safety cotton fabrics. [ABSTRACT FROM AUTHOR]

[Display omitted] • Novel bio-based nano-flame retardant with core–shell structure (PA-Fe-HBT) are prepared. • PA-Fe-HBT improved the flame retardancy, UV resistance and recyclability of PLA. • The corresponding mechanisms are proposed. Polylactic acid (PLA) is one of the solutions to the white pollution and energy crisis. However, the using performance (such as flame retardant, weather resistance and mechanical properties) and recycling performance limit its wide application. In this work, a bio-based additive (PA-Fe-HBT) with core–shell structure is synthesized by tannins microspheres and phytic acid (PA). By the presence of 3 wt% PA-Fe-HBT, the limited oxygen index is increased to 25.5%, and the sample can pass UL-94 V-0 grade. At the same time, the mechanical properties of the composites remain good. Besides, the ultraviolet aging resistance and ultraviolet protection ability of the composite are significantly improved. The ultraviolet (UV) transmittance of PLA/3%PA-Fe-HBT sample shows a decrease of 99.97% compared with control PLA. More importantly, the chemical recycling of composites is promoted by PA-Fe-HBT in the absence of external heating. After a simple purification, 88% purity of lactic acid is obtained. It is believed that this work proposes an ingenious design strategy to prepare PLA/PA-Fe-HBT composites with flame-retardancy, UV resistance and chemical recycling performances. [ABSTRACT FROM AUTHOR]

It is still a big challenge for textile industry in improving fire resistance and reducing melt dripping with minimal loss on the physical properties of polyethylene terephthalate (PET) fabrics. In this work, a highly-effective hyperbranched flame retardant (DT) was first synthesized by ester exchange without using any organic solvent. Then, the DT foam was prepared and blade coated on PET fabric to improve the fire performance. The prepared PET fabric with only 2.7% weight gain of DT was self-extinguished and did not produce any molten dripping during the vertical flammable test. The peak heat release rate and total heat release of the PET fabric sample with 19.4% DT were decreased by 42.0% and 57.1%, respectively compared with that of the control PET. Besides, the as-prepared PET fabric sample showed better physical properties such as breaking strength, vapor permeability, air permeability, antistatic property, and softness than the control PET fabric sample. The DT foam finishing process did not involve any organic solvent and consumed less water and energy compared with conventional fabric treatments. It is expected that this work provides a facile and eco-friendly strategy for fabricating flame retardant PET fabric with excellent comprehensive performances. [Display omitted] • A hyperbranched flame retardant (DT) was synthesized by a solvent-free approach. • Flame retardant PET fabrics were prepared by sustainable foam finishing. • The PET fabric with 2.7% DT was self-extinguished and free of molten drops. • The treated PET fabric showed excellent physical properties. [ABSTRACT FROM AUTHOR]