5c and 5d illustrate the effect of CHVE content on films cured at room temperature.
The dilution of the 2-VOES repeat units with CHVE repeat units reduces the rate of crosslinking by reducing the concentration of reactive groups in the system.
With regard to the effect of polymer composition, it can be easily seen that increasing the concentration of CHVE repeat units in the polymer increased the [T.sub.g] of the crosslinked network quite substantially.
Overall, increasing the CHVE concentration in the polymer decreased gel content, while increasing cure temperature of a given polymer increased gel content.
In contrast, the networks based on the copolymer with the highest CHVE content [i.e., poly(2-VOES-co-CHVE)-50/50] exhibited ductile or plastic-like behavior with much higher strains being achieved before fracture.
At a given cure temperature, elongation increased with increasing CHVE repeat unit content (i.e.
11a, at a given cure temperature, increasing the content of CHVE units in the copolymer generally increased the degree of adhesion.
At a given cure temperature, chemical resistance decreased with increasing CHVE repeat unit content (i.e., decreasing 2VEOS repeat unit content), and, at a given polymer composition, MEK double rubs increased with increasing cure temperature.
Thus, increasing the CHVE repeat unit content from 25 to 50 wt% changed the impact properties from excellent to poor.