High-fire-safety thermoplastic polyester constructed by novel sulfonate with benzimidazole structure
SCIENCE CHINA-MATERIALS(2021)
摘要
The flammability of thermoplastic polyesters and the subsequent heavy smoke and severe melt drips formed after ignition are the main obstacles hindering their widespread application. In this study, a novel ionic monomer containing sulfonate and benzimidazole was synthesized and incorporated into the main chain of poly(ethylene terephthalate) (PET, used as a model thermoplastic polyester) by melt copolymerization. The synergetic effect of ionic aggregation and carbonization endowed the obtained copolyester with high melt viscosity and excellent char-forming ability at high temperatures. The copolyester having a monomer content of 8 mol.% easily achieved the Underwriters Laboratories Inc 94 (UL-94) V-0 flammability rating without dripping and the limiting oxygen index value reached 33.0 vol.%. In addition, the total smoke production, peak heat release rate, and maximum CO production decreased by 45.2%, 60.5%, and 75.0%, respectively, compared with those of PET. In addition, the copolyester was spinnable, and showed greater adsorption efficiency (99.6%) for a cationic dye from solution compared to PET (6.5%), demonstrating the excellent affinity of the copolyester for the cationic dye. The obtained inherently fire-safe PET copolyester has great potential for applications in flame retardant textiles, artwork base materials, and decorative materials for transportation applications.
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关键词
fire safety,thermoplastic polyester,cross-linking network,carbonization
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