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Citation: Lü Xici, Chen Donglin. CHEMICAL STRESS RELAXATION OF LOW DENSITY POLYETHYLENE CROSS-LINKED BY γ-IRRADIATION[J]. Chinese Journal of Applied Chemistry, ;1984, 1(1): 87-94. shu

CHEMICAL STRESS RELAXATION OF LOW DENSITY POLYETHYLENE CROSS-LINKED BY γ-IRRADIATION

Lü Xici ¹ ,
Chen Donglin ²

1.
1. Department of Applied Chemistry, The University of Science and Technology of China;
2.
2. Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 16 August 1983
Available Online: 20 September 1983

The contionuous and intermittent chemical stress relaxations of γ-irra-diated cross-linked low density polyethylene containing different amount of antioxidant D were studied. It was discovered that the cleavage occurs randomly along the network chains. The relaxation may be divided mainly into the oxidation induction and oxidation breaking stages. The activation energy of chemical stress relaxation was found to be 30 Kcal/mole, which is independent of D content and radiation dose. By intermittent relaxation, it was shown that the β-value, the fraction of chains being reformed after scission is increasing with the increase of relaxation temperature and D content.
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