Patent ID: 7727652
Filing Date: 2010-06-01
Classification: H01M,Y02E,Y02P

Abstract:
1. A membrane electrode assembly for a polymer electrolyte fuel cell, comprising: a pair of electrodes comprising a catalyst; and a polymer electrolyte membrane disposed between the electrodes, the polymer electrolyte membrane comprising: a polymer segment A having an ion conductive component; and a polymer segment B not having an ion conductive component, wherein polymer segment A is a repeated constitutional unit shown in Chemical Formula 1 and polymer segment B is a repeated constitutional unit shown in Chemical Formula 4, wherein A is a bivalent electron attracting group, B is a bivalent electron donating group or a covalent bonding, Ar is an aromatic group having a substituent shown as —SO 3 H, m is an integer from 0 to 10, n is an integer from 0 to 10, and k is an integer from 1 to 4; wherein X is oxygen atom or sulfur atom, groups from R 9 to R 11 are the same or different, the groups are hydrogen atom, fluorine atom, nitrile group, or alkyl group, n is an integer not less than 2, and Q is a structure shown in Chemical Formula 5; wherein Y is a bivalent atom, organic group, or covalent bonding, groups from R 12 to R 19 are the same or different, the groups are hydrogen atom, fluorine atom, nitrile group, alkyl group, or aromatic group, and wherein a water absorption efficiency (an amount of water absorbed in the polymer electrolyte membrane that has been immersed in water at 90° C. for 30 minutes) is in a range from 0.1 to 3.0 g per 1 g of the polymer electrolyte membrane at a thawing temperature of from −30 to 0° C.