Study on Radiation-resistant Elastomer.
1. The effect of anti-radiation additives, on ethylene-propylene elastomer.
1990 Volume 2 Issue 3 Pages 156-161
Details
1990 Volume 2 Issue 3 Pages 156-161
In order to develop the radiation resistant elastomers, the effect of the additives on the radiation induced degradation of the additives on the radiation induced degradation of EPR (EP11 and EPO7P) has been studied.
The additives used were Sumilizer GM and propyl floranthen, the former retards the cross-linking of elastomers and the later is an energy transfer agent. Irradiation was carried out by 2 MeV electron beam.Maximum dose was 11.36 MGy. Mechanical properties of samples were measured at room temperature.
Ultimate elongation decreases with increasing dose. When 5phr of both additives are blended together in EP11, the value of ultimate elongation is 40% at 10MGy. This compounding formula has the remarkable retarding effect for increase in Young's modulus by irradiation. The increasing rate of Young's modulus of the sample for dose is about one forth of that of EP11 which is blended 3phr of Sumilizer.
The relationship between the ultimate elongation (Eb) and Young's modulus (Y.M) of each sample is expressed by equation (1).
Eb∝ (Y.M) -α (1)
when α is found to be from 0.54 to 0.75.
