Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (7): 667-670. Previous Articles    




  1. (上海交通大学化学化工学院 上海 200240)
  • 投稿日期:2004-08-13 修回日期:2004-12-15 发布日期:2010-12-10
  • 通讯作者: 颜德岳

Synthesis and Characterization of Thermally Stable Sulfonated Fluorine Containing Polybenzimidazoles

QING Sheng-Bo, HUANG Wei, YAN De-Yue*   

  1. (College of Chemistry and Chemical Technology, Shanghai Jiaotong University, Shanghai 200240)
  • Received:2004-08-13 Revised:2004-12-15 Published:2010-12-10
  • Contact: YAN De-Yue

A series of sulfonated fluorine containing polybenzimidazoles (sPBI) with controlled sulfonation degree (SD) were synthesized from 3,3'-diaminobenzidine, 5-sulfoisophthalic acid monosodium salt and 2,2-bis(4-carboxyphenyl)hexafluoropropane by solution copolycondensation in poly(phosphoric acid). The resulting polymers were characterized mainly by means of FT-IR, 1H NMR, GPC and TGA. The number-average molecular weights of the obtained samples are 61300~86000, and the polydispersity indices are 1.96~2.34. The sPBI samples present good film processing properties and excellent thermal stabilities. The temperatures of 5% and 10% weight loss increase with increasing SD of the samples, and are equal to 549 and 576 ℃ respectively for sample Ie (SD, 70%). This kind of sPBI is promising for application to proton exchange membrane.

Key words: polybenzimidazole, sulfonation, poly(phosphoric acid), proton exchange membrane