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Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (5): 1051.

• Articles • Previous Articles     Next Articles

Phase Structure Study of Toughening Ethynyl-capped Polyimide

WANG Da-Ming1, DANG Guo-Dong1, ZHAO Xiao-Gang1, ZHOU Hong-Wei1*, WANG Yun-Liang1,2, CHEN Chun-Hai1   

  1. 1. Alan G. MacDiarmid Lab, College of Chemistry, Jilin University, Changchun 130012, China;
    2. School of Pharmaceutical Sciences, Jiamusi University, Jiamusi 154007, China
  • Received:2009-08-28 Online:2010-05-10 Published:2010-05-10
  • Contact: ZHOU Hong-Wei. E-mail: zhw@jlu.edu.cn
  • Supported by:

    国家“八六三”计划项目(批准号: 2007AA03A231)资助.

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Abstract:

Thermosetting cross-linked polyimide(PI) prepolymer was synthesized from 4,4′-bisphenol A dianhydride(BPADA) and 3-aminophenylacetylene(APA) through a two-step polycondensation, modified by thermoplastic polyimides with different structures to form polymer blends. By regulating the quantity of thermoplastic polyimide, thermoplastic resins with similer structure and more flexible groups such as ether and symmetric methyl structures were introduced to the thermosetting/thermoplastic polyimide composite membranes. Differential scanning calorimeter(DSC) and scanning electron microscopy(SEM) were taken to evaluate the phase separation structure and compatibility of the system. The mechanical and thermal properties were also discussed. The results show that phase separation structure improve the mechanical properties of the mixture without sacrificing the excellent thermal stability of the original resin system.

Key words: Ethynyl-capped polyimide; Thermosetting resin; Blend; Phase separation; Toughening

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