(a)
Si
O
Si
O
Si
n
(b)
Si
O
Si
O
Si
n
(c)
Si
O
O
O
O
Si
Si
Si
Si
H
H
H
H
(d)
Si
O
Si
O
Si
n
Fig. 5.2 Chemical structures
of silicone-based gel
components. a PDMS,
b m-PDMS. Non-reactive
methyl-terminated PDMS,
c tetrafunctional silane as
cross-linking molecules,
d V-PDMS. Reactive
vinyl-terminated PDMS
156
5 Polymer Gels