Abstract

Irradiation effects of n-paraffins and squalane as the model compounds of polyetylene and ethylene-propylene copolymer, respectively, were investigated by products analysis. n-Paraffins of even and odd carbons as C20H42, C21H44, C23H48, and C24H50, and squalane (C30H62) were irradiated by gamma rays under vacuum in crystalline, glassy, and liquid state. The evolved gases were analyzed by gas chromatograpy and the molecular weight changes were analyzed by liquid chromatograpy and mass spectroscopy. The G-values of crosslinking of n-paraffins were 1.2 in crystalline state and 1.7 in liquid state, and showed no difference between the odd and even carbons. The G-value of squalane was 1.7 in liquid state and 1.3 in glassy state at -77°C. The double bonds were much accumulated in the crosslinked products, especially in liquid state. The probability of chain scission was estimated negligible, except chain ends of the molecule.

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