Dry-spun Polyimide Fibers with Excellent Thermal Stability,Intrinsic Flame Retardancy and Ultralow Smoke Release  

作　　者：Han Dong Yu-Ping Wang Xiu-Ting Li Xin Zhao Jie Dong Qing-Hua Zhang 

机构地区：[1]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai,201620,China [2]Jiangsu New Vision Advanced Functional Fiber Innovation Center Co.,Ltd.,Suzhou,215000,China

出　　处：《Chinese Journal of Polymer Science》2022年第11期1422-1431,共10页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51903038 and 21975040);the Scientific Research Innovation Plan of Shanghai Education Commission(No.2019-01-07-00-03-E00001);the Natural Science Foundation of Shanghai(No.21ZR1400200);the Project“Fiber materials and products for emergency support and public safety”from Jiangsu New Vision Advanced Functional Fiber Innovation Center Co.,Ltd.(No.2021fx020204)。

摘　　要：Polymer fiber with an ultrahigh thermal stability,superior flame retardancy and low smoke release during combustion is urgently needed and a crucial challenge for developing advanced fireproof textiles.In this study,a series of high-performance polyimide fibers are synthesized by copolymerizing 4,4'-diaminodiphenylmethane(MDA)into the pyromellitic dianhydride-p-phenylenediamine(PMDA-PDA)backbone for synergistically solving the technical challenge of poor fiber processing ability of these polyimides with a high inherent molecular rigidity.The glass transition temperature(Tg)of resultant fibers with the PDA molar ratio over 50 mol%reaches above 420℃ and their 10 wt%weight loss temperature(T10%)is within 543-633℃.For the typical fiber containing 80 mol%of PDA,the limiting oxygen index(LOI)reaches 39%and exhibits a rapid self-extinguishing performance after deviating from the flame.Meanwhile,this fiber exhibits the minimum heat release rate of 14.1 kW/m^(2) in a long ignition time of 813 s during combustion,revealing its better flame retardancy than the well-known Nomex fiber with a heat release rate of 140.6 kW/m^(2) during the 120 s ignition.Meanwhile,the total smoke production of this polyimide fiber is only 1/9 of the Nomex fiber.Accordingly,the excellent flame retardancy of polyimide fibers indicating them more attractive as the fireproof materials in the field of emergency protection.

关 键 词：Polyimide fiber COPOLYMERIZATION Thermal stability Flame retardancy Smoke release 

分 类 号：TQ342.731[化学工程—化纤工业]