196 HIGH PERFORMANCE POLYMERS
where the grafting and crosslinking reaction occurs
simultaneously.
Fluorinated PAES copolymers have been pre-
pared by the copolymerization of 4,4
-bis(4
-
fluoro-3
-trifluoromethyl benzyl) biphenyl, 3,
3
-disulfonate-4,4
-dichlorodiphenyl sulfone, and
4,4
-isopropylidene diphenol [135]. The degree of
sulfonation of the copolymers can be controlled
by the variation of ratio of 4,4
-bis(4
-fluoro-3
-
trifluoromethyl benzyl) biphenyl to 3,3
-disulfonate-
4,4
-dichlorodiphenyl sulfone. Good thermal stability,
oxidative stability, and mechanical properties at
degrees of sulfonation of 0.2–0.6 were established.
7.4.2 Medical Applications
Alkyl ether/PAES copolymer and alkyl
ether/poly(ether ketone) copolymer exhibit excellent
blood