Abstract
This paper proposes a new method to evaluate the G values of cross-linking (Gc) and scission (Gs) by the measurement of chemical stress relaxation. Continuous and intermittent chemical stress decay of tetrafluoroethylene-propylene elastomer was measured at 100°C under the irradiation of Co-60 γ ray. Gc was found to be 0.88 and Gs was 1.89 by this method.
On the other hand Gc and Gs of the polymer obtained by Charlesby-Pinner plot was 1.22 and 2.54, respectively. Chemical stress relaxation was also measured in nitrogen atmosphere at room temperature. In this condition, Gc and Gs was found to be 1.58 and 0.24, respectively. Gc and Gs obtained by Charlesby-Pinner plot at the same circumstance are 1.11 and 0.22 respectively.
