Comb-shaped alkyl imidazolium-functionalized poly(arylene ether sulfone)s as high performance anion-exchange membranes

Abstract

Comb-shaped poly(arylene ether sulfone)s with pendant alkyl imidazolium groups were developed as anion-exchange membranes (AEMs). The imidazolium-functionalized polymers with relatively long alkyl chains formed self-aggregated structures with large ionic clusters and clear hydrophilic-hydrophobic phase separation. These comb-shaped membranes, with ion-exchange capacities of only 0.92-1.14 meq g(-1), showed very high hydroxide conductivities of over 0.03 S cm(-1) at 20 degrees C and 0.14 S cm(-1) at 80 degrees C. Furthermore, the self-aggregated structure resulting from these comb-shaped polymers exhibited excellent thermal, mechanical and dimensional stability, as well as superior chemical stability at high pH.