Effects of sulfonated hydrophilic cross-linked network on the microstructure and properties of Nafion matrix

Abstract

A hydrophilic cross-linked proton exchange membrane was constructed in Nafion matrix based on azide polysulfone containing sulfonic acid (SPSU-N3) and alkynyl substituted polyvinyl alcohol (APVA) through azide-alkyne click chemistry reaction. Arising from the increased polarity of cross-linked network and high cross-linking density, the alcohol barrier performance of the Nafion membrane was greatly improved. The methanol permeability of the Nafion/cross-linked SPSU-N3 and APVA membrane decreases to 1.86×10-7 cm2/s, which is about 88% lower than that of the recasted Nafion membrane, and the proton selectivity is 18.5×104 S s/cm3.