含咪唑基磺化聚酰亚胺质子交换膜的制备及性能

将1,4,5,8 萘四酸二酐（NTDA）与不同的磺化二胺单体、5 氨基 （2 对氨基苯）苯并咪唑（APABI）及9,9’ 对(4 氨基苯基)芴（BAPF）在间甲酚介质中进行缩聚，通过控制磺化二胺与其他二胺单体的摩尔比，合成了一系列具有不同离子交换容量（IEC）的含咪唑基磺化聚酰亚胺（Im SPI）.同时，用溶液浇注法制得了具有良好机械强度的磺化聚酰亚胺薄膜，这些磺化聚酰亚胺薄膜在较高的相对湿度下显示出与Nafion112相当甚至更高的质子导电率，咪唑基的引入显著提高了膜的抗自由基氧化性，但膜的耐水性没有明显变化.

Synthesis and Properties of Benzimidazole Group-Containing Sulfonated Polyimide Proton Exchange Membranes

A series of benzimidazole group-containing sulfonated polyimides(Im-SPIs) were synthesized by condensation polymerization of 1,4,5,8-naphthalenetetracarboxylic dianhydride(NTDA),two sulfonated diamines,5-amino-(2-(4-aminophenyl)benzimidazole(APABI) and 9,9-bis(4-aminophenyl)fluorene(BAPF) in m-cresol at 180 °C for 20 h.By controlling the molar ratio between the sulfonated diamine and other diamine monomers,Im-SPIs with different IECs were obtained.Membranes with good mechanical strength were fabricated by solution cast method.These Im-SPI 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.