MANUFACTURING METHOD FOR ION CONDUCTIVE SOLID POLYMER ELECTROLYTE MEMBRANE WHICH INCLUDES CROSS-LINKING POLYVINYL ALCOHOL AS MATRIX AND SOLID POLYMER ELECTROLYTE MEMBRANE MANUFACTURED BY MANUFACTURING METHOD, AND MEMBRANE ELECTRODE ASSEMBLY AND SOLID POLYMER TYPE FUEL CELL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a solid polymer electrolyte membrane for fuel cell which has superior strength, ion conductivity, and stability.

SOLUTION: High-level saponified polyvinyl alcohol and a high polymer having a proton-dissociative group and/or its precursor and dicarboxylic acid used upon occasion are uniformly dissolved in an organic solvent in which they are dissolved. Film formation is performed using the solution to manufacture a precursor of a solid polymer electrolyte membrane. The precursor is heated to remove the organic solvent. When the dicarboxylic acid is used, the high-level saponified polyvinyl alcohol is cross-linked with the dicarboxylic acid to manufacture a solid polymer electrolyte membrane having the high polymer with the proton-dissociative group and/or its precursor dispersed in the high-level saponified polyvinyl alcohol cross-linked with the dicarboxylic acid. When the dicarboxylic acid is not used, on the other hand, a solid polymer electrolyte membrane is manufactured which has the high polymer with the proton-dissociative group and/or its precursor dispersed in the high-level saponified polyvinyl alcohol.

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