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BPDA/PPD/OTOL聚酰亚胺纤维的力学性能、形貌和结构

黄森彪1,2,马晓野1,郭海泉1,邱雪鹏1,高连勋1*   

  1. (1.中国科学院长春应用化学研究所高分子物理与化学国家重点实验室 长春 130022；
    2.中国科学院研究生院 北京 100039)
  • 收稿日期:2011-09-02 修回日期:2011-11-03 出版日期:2012-08-10 发布日期:2012-08-10
  • 通讯作者: 高连勋，研究员; Tel:0431-85262352; Fax:0431-85262926; E-mail:lxgao@ciac.jl.cn; 研究方向：聚酰亚胺材料和有机不对称合成

Mechanical Properties, Morphology and Structure of BPDA /PPD /OTOL Polyimide Fibers

HUANG Senbiao1,2, MA Xiaoye1, GUO Haiquan1, QIU Xuepeng1, GAO Lianxun1*   

  1. (1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of
    Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;
    2.Graduate School of Chinese Academy of Sciences,Beijing 100039,China)
  • Received:2011-09-02 Revised:2011-11-03 Published:2012-08-10 Online:2012-08-10

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2183

被引次数

22 | 4

摘要： 在3,3',4,4'-联苯四酸二酐（BPDA）和对苯二胺（PPD）体系中引入3,3′-二甲基联苯胺（OTOL），显著改善了纤维的力学性能。当m (PPD)/n (OTOL)=70/30时，纤维的拉伸强度可达到改性前的2倍，其拉伸强度和拉伸模量分别为1.50和80 Gpa。SEM照片显示了纤维的断面为圆形且没有孔穴，也没有明显的“皮芯”结构和原纤结构。WAXD和 SAXS分析表明纤维的轴向堆积和分子链取向在热牵伸过程中得到改善。

关键词: 聚酰亚胺纤维, 二甲基联苯胺, 扫描电子显微镜, X射线广角衍射, X射线小角散射

Abstract: After incorporating o-tolidine(OTOL) into 3,3′,4,4′-biphenyltetracarboxylic dianhydride(BPDA) and p-phenylenediamine(PPD) backbone, the mechanical properties of fibers were dramatically improved. The strength and modulus of BPDA/PPD/OTOL polyimide(PI) fiber(diamine molar ratio of n(PPD)∶n(OTOL)=70∶30) attained 1.50 and 80 GPa, respectively, which were two times of the tenacity of BPDA/PPD PI fibers. SEM pictures showed that the cross-sections of the fibers at each stage were circular and voids free, and also no obvious “skin-core” and microfibrillar structure and wide/small angle X-ray scattering(WAXD/SAXS) experiments indicated that the longitudinal stacks and the molecular orientation of PI fiber were improved in the heat-drawn process.

Key words: polyimide fiber, o-tolidine, SEM, wide angle X-ray diffraction, small angle X-ray scattering

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