Water resistant sulfonated polyimides based on 4,4′-binaphthyl-1,1′,8,8′-tetracarboxylic dianhydride (BNTDA) for proton exchange membranes

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• 作者：Jingling Yan ; Changpeng Liu ; Zhen Wang ; Wei Xing ; Mengxian Ding
• 关键词：4 ; 4&#x2032 ; -Binaphthyl-1 ; 1&#x2032 ; 8 ; 8&#x2032 ; -tetracarboxylic dianhydride (BNTDA) ; Sulfonated polyimides ; Water resistance
• 刊名：Polymer
• 出版年：2007
• 期刊代码：83_00323861
• 类别：ms
• 出版时间：5 October 2007
• 卷：48
• 期：21
• 页码：6210-6214
• 文件大小：267 K

摘要

A series of sulfonated polyimides (SPIs) were synthesized in m-cresol from 4,4′-binaphthyl-1,1′,8,8′-tetracarboxylic dianhydride (BNTDA), 4,4′-diaminodiphenylether-2,2-disulfonicacid (ODADS), and 4,4′-diamino-diphenyl ether (ODA) in the presence of triethylamine and benzoic acid. The resulted polyimides showed much better water resistance than the corresponding sulfonated polyimides from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) and ODADS, which is contributed to the higher electron density in the carbonyl carbon atoms of BNTDA. Copolyimides S-75 and S-50 maintained their mechanical properties and proton conductivities after aging in water at 100 °C for 800 h. The proton conductivity of these SPIs was 0.0250–0.3565 S/cm at 20 °C and 100%relative humidity (RH), and increased to 0.1149–0.9470 S/cm at 80 °C and 100%RH. The methanol permeability values of these SPIs were in the range of 0.99–2.36 × 10⁻⁷ cm²/s, which are much lower than that of Nafion 117 (2 × 10⁻⁶ cm²/s).