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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (7): 667-670. 上一篇    

研究简报

耐高温含氟磺化聚苯并咪唑的合成及表征

卿胜波，黄卫，颜德岳*   

  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

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1423

被引次数

40

采用5-磺酸钠间苯二甲酸、双(苯甲酸)六氟丙烷与3,3',4,4'-四氨基联苯在多聚磷酸中通过共缩聚反应, 合成了一系列磺化度(定义为100个重复单元中所含的磺酸基个数, SD)可控的含氟磺化聚苯并咪唑(sPBI), 并利用红外光谱、核磁共振、凝胶色谱和热失重分析等手段对其结构、分子量与热稳定性进行了表征, 还考察了其溶解性和成膜性. 结果表明, sPBI的数均分子量(Mn)为61300～86000, 多分散指数介于1.96～2.34之间, 并且sPBI具有良好的成膜性和优异的热稳定性能, 其5%和10%热失重对应温度均随着SD的增加而有所提高, 在SD为70%时分别为549和576 ℃. 此类聚合物在质子交换膜材料方面具有一定的应用前景.

关键词: 聚苯并咪唑, 磺化, 多聚磷酸, 质子交换膜

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