热处理过程中聚酰亚胺纤维结构与性能的演变  

Evolution of structure and properties of polyimide fibers during thermal treatment

作　　者：甘锋 董杰[1] 张殿波 谭文军[1] 赵昕[1] 张清华[1] Gan Feng;Dong Jie;Zhang Dianbo;Tan Wenjun;Zhao Xin;Zhang Qinghua(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620)

机构地区：[1]东华大学材料科学与工程学院纤维材料改性国家重点实验室

出　　处：《合成纤维工业》2018年第1期21-25,共5页China Synthetic Fiber Industry

基　　金：国家自然科学基金项目(51233001);973计划项目(2014CB643603)

摘　　要：以联苯二酐与2,5-二(4-氨基苯基)嘧啶、4,4-二氨基二苯醚进行共聚,制备高相对分子质量的聚酰胺酸(PAA)纺丝原液,采用湿法纺丝、热环化、热拉伸制备共聚聚酰亚胺(PI)纤维,研究了热处理过程中PI纤维结构与性能的演变过程。结果表明:当热环化温度高于300℃时,PAA基本环化形成PI结构;在热拉伸作用下,PI纤维的凝聚态结构更加规整,且随拉伸倍数的提高,纤维的晶区取向度增加,同时伴随着力学性能的提升;当热拉伸倍数为2.00时,所得PI纤维的力学性能最佳,其拉伸强度及拉伸模量分别可达到21.8 cN/dtex和642.7 cN/dtex。An ultrahigh-relative molecular mass poly（ amic acid）（ PAA） dope was synthesized by the copolymerization of 3,3＇,4,4＇-biphenyltetracarboxylic dianhydride with 2,5-bis（ 4-aminophenyl）-pyrimidine and 4,4＇-diaminodiphenyl ether. The corresponding co-polyimide（ PI） fiber was produced via wet-spinning process prior to thermal imidization and thermal drawing. And the evolution of the structure and properties of PI fibers was investigated during the thermal treatment. The results indicated that PAA was basically imidized into PI when the thermal imidization temperature was higher than 300 ℃; the crystalline structure of PI fiber became more regular under the thermal drawing process; the orientation degree of the fiber was increased in the crystalline region with the increase of draw ratio,and the mechanical properties were also enhanced at the same time till a maximum at the draw ratio of 2. 00,i. e. the tensile strength and modulus of 21. 8 cN/dtex and 642. 7 cN/dtex,respectively.

关 键 词：聚酰亚胺纤维 湿法纺丝 热拉伸 结构 性能 

分 类 号：TQ342.731[化学工程—化纤工业]