High Performance Polymers, 2nd Edition

7: POLY(ARYLENE ETHER SULFONE)S 183

S

O

O

KO

Cl

S

O

O

O

n

Figure 7.5 Condensation of chlorophenylsulfonyl

phenoxide.

S

O

O

F

F

SO

2

Na

X

X = F, Cl

S

O

O

X

F

n

Figure 7.6 Condensation of 4-halobenzenesulfinate

catalyzed by 4,4



-difluorodiphenyl sulfone.

the monomers. Later, in the polycondensation of

chlorophenylsulfonyl phenoxide, an increasedreactiv-

ity of the polymer end group was detected [33]. The

reaction scheme is shown in Figure 7.5. The polymeric

end group reacts ca. 20 times faster than the monomer.

Essentially the same phenomenon was observed

in the polycondensation of 4-chlorobenzenesulfinate

or 4-fluorobenzenesulfinate. The addition of a small

amount of 4,4



-difluorodiphenyl ...