Patent ID: 7972732

Claim:
A membrane humidifier for a fuel cell, the membrane humidifier comprising: a first flow field plate adapted to facilitate flow of a first gas thereto; a second flow field plate adapted to facilitate flow of a second gas thereto; a polymeric membrane disposed between the first and second flow fields, the membrane adapted to permit transfer of water, the polymeric membrane comprising a first polymer having a polymer segment comprising polymer segment 1: wherein: Z 1 is —SO 2 X, —PO 3 H 2 , or —COX; E 1 is an aromatic containing moiety; A is absent or O or a chain extender having a carbon backbone; X is an —OH, a halogen, an ester, or P 1 , P 2 are each independently absent, —O—, —S—, —SO—, —SO 2 —, —CO—, —NH—, NR 2 —, or —R 3 —, and R 2 is C 1-25 alkyl, C1-25 aryl, or C 1-25 arylene; R 3 is C 1-25 alkylene, C 1-25 perfluoroalkylene, or C 1-25 arylene; R 4 is trifluoromethyl, C 1-25 alkyl, C 1-25 perfluoroalkylene, C 1-25 aryl, or another E 1 group; and Q 1 is a fluorinated cyclobutyl moiety.