Proton Polymeric Gel Electrolyte Membranes Based on Polymethylmethacrylate

Abstract

In this work we report the synthesis of proton‐conducting gel membranes obtained by incorporating salicylic acid in a highly plasticized (poly)methylmethacrylate matrix. We have prepared these gel membranes by using particular solvent mixtures consisting of propylene carboanate (PC), Ethylene carboanate (EC), and fixed molar ratios of either dimethylformamide (DMF), methylformamide (MF), or formamide (F). The conductivity of the gel membranes prepared from these three‐solvent mixtures is higher than that obtained by the parent liquid PC/EC solutions. Furthermore, the membranes are stable at moderately high temperatures (not exceeding 70°C), and their conductivity is only moderately dependent on the relative humidity conditions. © 1999 The Electrochemical Society. All rights reserved.