METHOD OF MANUFACTURING MEMBRANE ELECTRODE ASSEMBLY FOR SOLID POLYMER FUEL CELL, MEMBRANE ELECTRODE ASSEMBLY MANUFACTURED BY THE METHOD, AND FUEL CELL USING THE MEMBRANE ELECTRODE ASSEMBLY

摘要

PPROBLEM TO BE SOLVED: To provide a membrane electrode assembly (MEA) which is useful for a constituent material of a solid polymer fuel cell, a direct liquid fuel cell and a direct methanol fuel cell, and has a high methanol-blocking property and an excellent property of connectivity with an electrode. PSOLUTION: A method of manufacturing a membrane electrode assembly is characterized in that an electrolyte membrane for a fuel cell is manufactured from a material of a polymer film, which has features of including a polymer compound (A) having a melting point of 220C or higher and a polymer compound (B) having a melting point of no higher than 220C as essential constituents, and having a phase predominantly including the polymer compound (A) and a phase predominantly including the polymer compound (B) in observation of a cross-sectional photograph of the film using an electron microscope, with the phase predominantly including the polymer compound (B) being continued both in a thickness direction and in a width direction, and the electrolyte membrane for a fuel cell is subjected to thermal pressing along with an electrode at no higher than such a temperature that a coefficient of elasticity of the polymer compound (B) becomes 1.010SP6/SPPa. PCOPYRIGHT: (C)2009,JPO&INPIT