Abstract
Effects of gamma radiation on the dynamic mechanical properties of polyvinyl chloride (PVC) have been studied at audio frequencies from 80 ‡K to 450 ‡K for doses up to 1400 megarads. Two damping peaks were observed between 80 ‡K and 400 ‡K. The onset of main relaxation near 350 ‡K shifted to lower temperatures at low doses, and then shifted to higher temperatures at a dose of 1400 megarads. Only slight changes are discernible in the damping peak near 250 ‡K upon irradiation, but definite variations are noted in the modulus curves. Upon irradiation to 270 megarads an additional damping peak appeared near 150 ‡K accompanied by an increase in modulus at lower temperatures. The height of this peak increased with increasing radiation dose. Crosslinking was confirmed from rubber elastic behavior, swelling, and solvent extraction studies. Some tentative explanations for the changes occurring in the dynamic mechanical properties of irradiated PVC are given in terms of crosslinking, loss of crystallinity, and dehydrochlorination followed by the formation of conjugated series of double bonds.
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