SULFONATED POLYMER FILM, METHOD FOR PRODUCING THE SAME AND ELECTROLYTIC FILM FOR FUEL CELL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a sulfonated polymer film having a high methanol-blocking property in addition to a proton-conducting property and useful as an electrolytic film for solid polymer type fuel cells and direct alcohol type fuel cells.

SOLUTION: The method for producing the sulfonated polymer film comprises modifying a cyclic olefin-based polymer with an acetate group-containing compound to provide a modified cyclic olefin-based polymer, carrying out saponification treatment of the polymer film to afford the saponified cyclic olefin-based polymer and bringing a polymer composed of the saponified cyclic olefin-based polymer into contact with a sulfonating agent.

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