A composition comprising a
copolymer having repeating units in any sequence of Formula IwhereinRf is a straight or branched perfluoroalkyl group having from about 1 to about 20 carbon atoms, or a mixture thereof, which is optionally interrupted by at least one
oxygen atom,X3 is
oxygen or X1,each X1 is independently an organic
divalent linking group having from about 1 to about 20 carbon atoms, optionally containing an
oxygen,
nitrogen, or
sulfur, or a combination thereof,G is F or CF3,A is an
amide,j is zero or positive integer,X2 is an
organic linking group,Y is O, N or S,h is zero when Y is N, and h is one when Y is O or S,Z is H, a straight or branched
alkyl group having from about 1 to about 4 carbon atoms, or
halide,B is H orwhereinRf, X1, X3, G, A, and j are as defined above, provided that when B is H, j is a positive integer,m is a positive integer,q is zero or a positive integer when Y is O, and q is a positive integer when Y is N or S,p is zero or a positive integer when Y is O, and p is a positive integer when Y is N or S,each W is independently various
copolymer units.