Abstract
New proton-conducting polymer electrolytes based on new porous films of polybenzimidazole doped with phosphoric acid have been obtained. The porous polybenzimidazole films were prepared by leaching out a low-molecular-weight compound using a selective solvent of the porogen from polymer/porogen mixtures. This method allows control over the porosity level up to porosities of 75%. The pore size and morphology strongly depend on the porogen/PBI ratio as observed by SEM. The pore size varies from dimethyl phthalate>diphenyl phthalate>triphenyl phosphate. The acid uptake of the membranes, and therefore the ionic conductivity of the films, increases with the porosity. Ionic conductivity as high as 5 × 10-2 S/cm and mechanically stable membranes are easily obtained by soaking the highly porous films...
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