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Mixtures of protonated and deuterated polyethylene were irradiated in the melt. The degree of crystallinity, the degree of crosslinking, as well as the enthalpy?H and the melting pointTM were determined. No significant differences in the degree of crosslinking between protonated and deuterated chains were found. The mass specific entropy?S of the uncrosslinked samples remained constant and independent of the deuterium concentration. For the crosslinked samples, a netpoint entropy was postulated. A weaker Van der Waals interaction could explain the decrease in melting temperature by deuteration (for weakly crosslinked samples).

Network properties of mixtures of protonated and deuterated polyethylene