Abstract
Anhydrous proton-conducting electrolytes composed of a mixture of [where PEG is poly(ethylene glycol)] acid and a sol–gel-based copolymer were prepared. These copolymers were prepared by mixing the monomer and different bulky comonomers: phenyltriethoxysilane, diphenyldimethoxysilane, and isobutyltrimethoxysilane. The copolymers showed smaller volume fractions of PEG and nearly the same fractional free volume as the parent polymer. End-group analysis showed that the incorporation of bulky group decreased the degree of condensation in the sol–gel polymer. This loss of condensation lead to an increase in the fluidity of the copolymers, which in turn resulted in larger ionic conductivities in the copolymers compared with the parent polymer.
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