
7: POLY(ARYLENE ETHER SULFONE)S 187
N
N
N
OH
OHO
S
F
O
O
Figure 7.11 2,4-Bis-(4-hydroxyphenyl)-6-(4-(4-(4-
fluorobenzenesulfonyl) phenoxy) phenyl)-1,3, 5-
s
-
triazin.
The polymerization was carried out in nitrobenzene
at 120
◦
C for 3 h in the presence of a catalytic amount
of FeCl
3
[56].
7.2.9 Modification
When the surface properties are to be changed, e.g.,
in membrane technology, graftingtechniques are used.
However, sometimesit is desirable to modifythe build-
ing material, in asimilar way assurface grafting affects
just the surface. Poly(ether sulfone) can be modified
by dissolving it in NMP and adding acrylic acid (AA)
to the solution. The solution is cast between ...