含苯并咪唑基团聚酰亚胺的合成与表征

使用一种含有苯并咪唑基团的二胺单体2-(3-氨基苯基)-5-氨基苯并咪唑与二酐单体进行缩聚反应, 得到一系列聚酰亚胺薄膜, 并对该类薄膜的热性能和机械性能进行表征.结果表明, 该类薄膜具有较高的耐热性和良好的机械性能.同时, 二胺单体中氨基的相对位置赋予分子链以较高的弯曲性, 使该类聚酰亚胺具有较好的热塑性和较高的热膨胀系数.

Synthesis and Properties of Polyimides Containing Benzimidazole Group

A diamine monomer containing benzimidazole unit 2-(4-aminophenyl)-4-aminobenzimidazole was polymerized with commercially available dianhydrides to obtain polyimide films. The results of thermal and mechanical properties characterization show that these polyimide films possess considerable thermal resistance and good mechanical properties. Meanwhile, the relative position of the amino group in the diamine monomer imparts bent and distorted conformation of the polyimides, leading to good thermal plasticity and large value of coefficient of thermal expansion.