Proton polymeric gel electrolyte membranes based on polymethylmethacrylate

In this work we report the synthesis of proton-conducting gel membranes' ob tained by incorporating salicylic acid in a highly plasticized (poly)methyl methacrylate matrix. We have prepared these gel membranes by using particul ar solvent mixtures consisting of propylene carbonate (PC), ethylene carbon ate (EC), and fixed molar ratios of either dimethylformamide (DMF), methylf ormamide (MF), or formamide (F). The conductivity of the gel membranes prep ared from these three-solvent mixtures is higher than that obtained by the parent liquid PC/EC solutions. Furthermore,the membranes are stable at mode rately high temperatures (not exceeding 70 degrees C), and their conductivi ty is only moderately dependent on the relative humidity conditions. (C) 19 99 The Electrochemical Society. S0013-4651(98)05-020-4. All rights reserved .