Chemistry Reference
In-Depth Information
Stoichiometrically balanced
Dangling-chain network
0.20
0.05
2
C
1
, N mm
-2
Figure 7.12:
The ultimate strength as a function of the high-deformation modulus for networks that
either contain a negligible number of dangling ends (stoichiometrically balanced end
linking) or contain dangling ends introduced by using less than the stoichiometrically
required amount of end-linking agent. In the latter case, decrease in 2
C
1
corresponds to
increase in the number of dangling ends.
Fi g u re 7.13:
An interpenetrating network structure in which one network is generated by a conden-
sation end-linking reaction and the other by an additional end-linking reaction (heavier
lines).
mixed into them with a multifunctional silane (in an addition reac-
tion).
175
Interpenetrating networks (IPNs) can be unusual with regard to
both equilibrium and dynamic mechanical properties. For example,
such materials can have considerable toughness and unusual damping
characteristics.
