A trifluorostyrene and substituted vinyl compound based partially fluorinated
copolymer,
an ionic conductive polymer membrane including the same, and a fuel cell adopting
the ionic conductive polymer membrane, wherein the partially fluorinated copolymer
has formula (1):
##STR1##
where each of R1, R2 and R3 is F, H or CH3;
X is a hydroxy group or a trifluoromethyl group; m is an integer greater than zero;
n is an integer greater than zero; and p, q and r are zero or integers greater
than zero.
