HIGHLY PROTON-CONDUCTIVE POLYMER ELECTROLYTE MEMBRANE HAVING EXCELLENT MECHANICAL STRENGTH AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a highly proton-conductive polymer electrolyte membrane that satisfies both proton conductivity and membrane strength and has excellent mechanical strength and a method for producing the same.

SOLUTION: A vinyl monomer is graft polymerized on an aromatic hydrocarbon-based polymer film substrate to introduce graft chains into the substrate and thereafter a functional monomer having a sulfonic acid group or a functional groups convertible to a sulfonic acid group is graft polymerized to introduce the sulfonic acid group or the functional groups convertible to a sulfonic acid group. Since the graft chains obtained by graft polymerization of the vinyl monomer can also be utilized as scaffold polymers, the graft polymerizability of the functional monomer to the aromatic hydrocarbon-based polymer film substrate is sufficiently improved to enable the preparation of a polymer electrolyte membrane that excels not only in proton conductivity and mechanical strength but also in dimensional stability.

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