Patent ID: 8058352

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; and 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: E 0 -P 1 -Q 1 -P 2 1 wherein: E o is moiety having a protogenic group; P 1 , P 2 are each independently absent, â€”Oâ€”, â€”Sâ€”, â€”SOâ€”, â€”COâ€”, â€”SO 2 â€”, â€”NHâ€”, â€”NR 2 â€”, or â€”R 3 â€”; R 2 is C 1-25 alkyl, C 1-25 aryl or C 1-25 arylene; R 3 is C 1-25 alkylene, C 1-25 perfluoroalkylene, perfluoroalkyl ether, alkylether, or C 1-25 arylene; and Q 1 is a fluorinated cyclobutyl moiety.