分子内阻燃PET纤维的结构性能

 以反应性无卤阻燃剂CEPPA为第三单体，通过共聚改性制备了分子内阻燃PET树脂，并经熔融纺丝纺制阻燃PET纤维。利用元素分析和核磁共振分析了阻燃PET树脂中的磷含量，结果表明大部分CEPPA聚合到PET分子链中。对阻燃PET纤维结晶性能、染色行为、力学性能及燃烧性能也进行了研究，结果表明阻燃PET纤维的结晶度随着磷含量的增加而降低，这导致了纤维染色性能的提高。阻燃PET纤维采用分散染料在常压沸染条件下上染率可达90%以上。此外纤维具有优异的阻燃性能，极限氧指数(LOI)值约为35%，并且抗熔滴性能得到了改善.

Structures and properties of intramolecular flame-retardant PET fibers

Intramolecular flame-retardant PET resins were prepared via copolymerization reaction by using reactive halogen-free flame retardant CEPPA as a third monomer and then melt spun into flame-retardant PET fibers.The phosphorus content analysis of the flame-retardant PET resins by elementary analysis and NMR showed that the majority of CEPPA were directly reacted into the PET chains.The crystallinity,dyeing behavior,mechanical properties and flammability of the flame-retardant PET fibers were also investigated.The results showed that the crystallinity of the fibers was decreased as increasing the phosphorus content,which led to the improved dyeing properties of the fibers.The dye-uptake of the fibers with disperse dyes under atmosphere pressure and at boiling temperature dyeing was above 90%.Moreover,the flame-retardant PET fibers exhibit superior flame retardance and improved anti-dripping property,with the limiting oxygen index(LOI) value above 35%.