耐高温含氟磺化聚苯并咪唑的合成及表征  

Synthesis and Characterization of Thermally Stable Sulfonated Fluorine Containing Polybenzimidazoles

作　　者：卿胜波[1] 黄卫[1] 颜德岳[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《化学学报》2005年第7期667-670,F010,共5页Acta Chimica Sinica

摘　　要：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.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, H-1 NMR, GPC and TGA. The number-average molecular weights of the obtained samples are 61300 similar to 86000, and the polydispersity indices are 1.96 similar to 2.34. The sPBl 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 degrees C respectively for sample I-e (SD, 70%). This kind of sPBl is promising for application to proton exchange membrane.

关 键 词：聚苯并咪唑 表征 合成 含氟 耐高温 间苯二甲酸 共缩聚反应 热失重分析 数均分子量 热稳定性能 六氟丙烷 多聚磷酸 红外光谱 核磁共振 凝胶色谱 分散指数 质子交换 成膜性 磺酸钠 苯甲酸 磺酸基 磺化度 溶解性 膜材料 聚合物 

分 类 号：O633.5[理学—高分子化学] TQ245.12[理学—化学]