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| Synthesis and Properties of Benzimidazole Group-Containing Sulfonated Polyimide Proton Exchange Membranes
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| XU Hong, XU Fan, ZHANG Gui-Mei, MA Rui, GUO Xiao-Xia, FANG Jian-Hua |
| (School of Chemistry and Chemical Engineering, Shanghai Jiaotong University,Shanghai 200240, China) |
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Abstract A series of benzimidazole groupcontaining sulfonated polyimides (ImSPIs) were synthesized by condensation polymerization of 1,4,5,8naphthalenetetracarboxylic dianhydride (NTDA), two sulfonated diamines, 5amino(2(4aminophenyl)benzimidazole (APABI) and 9,9bis(4aminophenyl)fluorene (BAPF) in mcresol at 180 °C for 20 h. By controlling the molar ratio between the sulfonated diamine and other diamine monomers, ImSPIs with different IECs were obtained. Membranes with good mechanical strength were fabricated by solution cast method. These ImSPI membranes display high proton conductivities at high relative humidities which are comparable or higher than that of Nafion. The incorporation of imidazole groups to polymer structure results in significant improvement in radical oxidative stability but has little effect on the water stability of the membranes.
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Received: 18 March 2011
Published: 30 March 2012
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