Patent ID: 7897693

Claim:
A polymer comprising polymer segments 1 and 2: E 1 (SO 2 X) d -P 1 -Q 1 P 2 [1] E 2 -P 3 -Q 2 -P 4 [2] connected by a linking group L 1 to form polymer unit 3 and polymer unit 4: E 2 -P 3 -Q 2 -P 4 j -L 1 E 1 (Z 1 ) d -P 1 -Q 1 -P 2 i [3] E 2 -P 3 -Q 2 -P 4 j -L 1 E 1 (SO 2 X) d -P 1 -Q 1 -P 2 i [4] wherein: Z 1 is —SO 2 X, —PO 3 H 2 or —COX; E 1 is an aromatic-containing moiety; E 2 is an unsulfonated aromatic-containing and/or aliphatic-containing moiety; L 1 is a linking group; X is an —OH, a halogen, an ester, or d is a number of Z 1 functional groups attached to E 1 ; P 1 , P 2 , P 3 , P 4 are each independently absent, —O—, —S—, —SO—, —SO 2 —, —CO—, —NH—, NR 2 —, —R 3 —, and 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, 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; Q 1 , Q 2 are each independently a fluorinated cyclobutyl moiety; i is a number representing repetition of polymer segment 1; and, j is a number representing repetition of a polymer segment 2.