POLYMER ELECTROLYTE MEMBRANE AND PRODUCING METHOD THEREOF, MEMBRANE-ELECTRODE ASSEMBLY AND FUEL CELL USING THE POLYMER ELECTROLYTE MEMBRANE, AND EVALUATION METHOD OF IONIC CONDUCTIVITY OF THE POLYMER ELECTROLYTE MEMBRANE

摘要

Disclosed is a method for producing a polymer electrolyte membrane, which enables to easily obtain a polymer electrolyte membrane having excellent ion conductivity in the thickness direction. A preferable example of the method for producing a polymer electrolyte membrane is a method for producing a polymer electrolyte membrane having a micro phase separation structure, and the method comprises an evaporation step for evaporating a solvent from a solution containing a polymer electrolyte having an ion conducting group. In the evaporation step, time from the start to the completion of the evaporation of the solvent is limited to 60 minutes or less.