
166 HIGH PERFORMANCE POLYMERS
N
HO
OH
O
OH
S
O
O
F
F
OH
OH
Figure 6.12 Monomers for cardo PEEK copolymers
[85].
(4-hydroxyphenyl)isoindolin-1-one moiety with 1,3-
propanesulfone. In this way, the resulting sul-
fonated copolymers are containing side-chain sul-
foalkyl groups −−CH
2
CH
2
−−O−−CH
2
CH
2
CH
2
SO
3
H.
A characteristic hydrophilic/hydrophobic micro-
phase separated morphology with small intercon-
nected and hydrophilic clusters has been established in
these structures. A high proton conductivity together
with low dimensional changes is observed. These
materials find use for proton exchange membranes
[85].
6.5.5.3 Hyperbranched PEEK
Sulfonated hyperbranched PEEK was synthesized ...