Perfluorosulfonic acid polymer-azole blend membrane, production method thereof, and solid polymer fuel cell

摘要

PROBLEM TO BE SOLVED: To provide a proton exchange membrane in which perfluoro sulfonic acid polymer is used and that has a good high-temperature stability.SOLUTION: There is provided a proton exchange membrane that is obtained by preparing a perfluoro sulfonic acid polymer-azole blend membrane, followed by heat treating the membrane at a 130°C to 200°C range; the membrane has an improved high-temperature stability as compared to those without the heat treatment, and also the membrane has a small swelling ratio even for a solvent such as methanol; and also, a solid polymer-type fuel cell in which this heat-treated membrane is used as the polymer electrolyte, is stably worked for a long duration in a durability cycle characteristic run at cell temperature of 70°C and 100°C.