POLYMER ELECTROLYTE FILM FOR FUEL CELL WHICH HAS SILANE CROSSLINKED STRUCTURE, AND ELECTRODE ASSEMBLY FOR FUEL CELL COMPRISING THE POLYMER ELECTROLYTE FILM

摘要

Disclosed is an electrolyte film which can maintain excellent cell properties over a long period under high temperature and low water absorption conditions which is the most important characteristic for a fuel cell. Specifically disclosed is a process for producing a polymer electrolyte film for a fuel cell, which comprises the steps of: graft-polymerizing a vinyl silane coupling agent having a phenyl group capable of having a sulfonate group on a polymer film base material to form a graft molecule chain; introducing a sulfonate group into the phenyl group in the graft molecular chain; and hydrolyzing/fusing the alkoxy groups in the graft molecule chain to impart a silane-crosslinked structure between the graft molecule chains. Also disclosed is a polymer electrolyte film for a fuel cell, which is produced by the process.