Abstract
The effect of different doses of γ-irradiation on the mechanical and relaxation properties of High Density Polyethylene (HDPE) and Low Density Polyethylene (LDPE) were studied. It was found that HDPE is more susceptible than LDPE to the influence of radiation. Recognizable differences are observed for all parameters between the unirradiated and irradiated cross-linked polyethylene. Existence of a relaxation mechanism within the first 200 s is reported. The shear modulus for all samples is also obtained and discussed. These data are used to calculate the strain energy density using the equation proposed by Blatz et al (1974 Trans. Soc. Rheol. 18 145-61), based on the n-measure of Sethe. It was found that the n-measure is still a material constant for both types and independent of γ-irradiation dose.
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