含三苯基氧膦基团的磺化聚苯并咪唑质子交换膜

Sulfonated Polybenzimidazoles with Triphenyl Phosphine Oxide Groups for Proton Exchange Membrane

通过酯化反应合成了3,3′-二磺酸钠-4,4′-二甲酸二甲酯基联苯和二(4-甲酸甲酯基苯基)苯基氧膦单体,并将其与3,3′-二氨基联苯胺共缩聚,制备了含三苯基氧膦基团的可溶性磺化聚苯并咪唑。三苯基氧膦基中的苯侧基促使高分子链排列疏松,产物溶解性提高;而氧膦基团增加了产物的吸水率,并显著提高了其电导率。

3,3＇-Disulfonate-4,4r-dimethyl biphenyldicarboxylate （SMPC） and bis（4-methyl benzoate）phe- nyl phosphine oxide （MBPO） were synthesized by esterifieation. Subsequently, soluble sulfonated polybenzimidazoles with triphenyl phosphine oxide groups were prepared by polycondensation of SMPC and MBPO with 3,3＇-diaminobenzidine in order to improve the solubility and proton conductivity of the product. The phenyl pendant groups of triphenyl phosphine oxide moieties made the polymer backbone to arrange loosely and thus endowed the product with good solubility. Moreover, phosphine oxide groups enhanced the water uptake of the products and greatly improved their proton conductivity.