POLYMER ELECTROLYTE MEMBRANE, LAMINATE THEREOF, AND THEIR PRODUCTION METHODS

摘要

Provided is a method for producing a laminate in which an ion conductive polymer electrolyte membrane is laminated on a supporting substrate in a state where any one surface of the polymer electrolyte membrane is bonded to the supporting substrate, a difference in a contact angle against water between a first surface and a second surface of the surface of the ion conductive polymer electrolyte membrane being more than 30° in a case where the first surface is the side having a small contact angle against water of a membrane surface and the second surface is the side having a large contact angle against water of the membrane surface, the method includes the steps of: preparing a polymer electrolyte solution in which a polymer electrolyte containing an ion conductive polymer having an aromatic group in the main chain and/or the side chain, and also having an ion exchange group bonded directly to the aromatic group or bonded indirectly to the aromatic group with another atom or atomic group interposed therebetween is dissolved in a solvent; and applying the polymer electrolyte solution on the supporting substrate by flow casting thereby laminating the polymer electrolyte membrane on the supporting substrate.