New proton-conducting polymer electrolyte membranes having phosphoric acid groups
have been systematically synthesized. These homopolymers and copolymers were
prepared by a conventional radical polymerization and a copolymerization with acrylonitrile
or styrene or similar materials. The phosphoric acid groups can be cross-linked by heat
treatments at 100° C, and hence their membranes showed excellent mechanical properties
and chemical stability. Measurements of the water absorption and differential scanning …