Preparation of High-performance Polyimide Fibers with Wholly Rigid Structures Containing Benzobisoxazole Moieties  

作　　者：Yu-Ting Fang Feng Gan Jie Dong Xin Zhao Xiu-Ting Li 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]School of Textile Materials and Engineering,Wuyi University,Jiangmen 529020,China

出　　处：《Chinese Journal of Polymer Science》2022年第3期280-289,I0007,共11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);Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515110897)。

摘　　要：In this work, a fully rigid coplanar symmetric heterocyclic unit was introduced into the rigid polyimide macromolecular backbone structure to prepare high-performance polyimide fibers. The novel co-polyimide(co-PI) fibers based on 3,3',4,4'-biphenyltetracarboxylic anhydride(BPDA), p-phenylenediamine(PDA) and 2,6-(4,4'-diaminodiphenyl) benzo[1,2-d:5,4-d'] bisoxazole(PBOA) were fabricated via a twostep wet-spinning method. The effects of benzobisoxazole moiety on spinnability, aggregation structure, and mechanical properties of fibers were systematically discussed. The detailed structural analysis revealed that the well-defined aggregation structures of co-PI fibers were obtained from initial amorphous structure when post hot-drawing temperature was higher than 460 ℃ under proper drawing ratio, and the incorporation PBOA into BPDA-PDA structures produced more compact structural co-PI fiber than homo BPDA-PDA fiber. The BPDA-PDA/PBOA co-PI fibers exhibited optimum tensile strength and modulus of 2.65 and 103 GPa, which increased by 182% and 84% compared to the homo BPDA-PDA fiber, respectively.

关 键 词：Polyimide fiber Benzobisoxazole CO-POLYMERIZATION Microstructure Mechanical properties 

分 类 号：TQ342.731[化学工程—化纤工业]