Abstract
Radiation-induced oxidative degradation of two types of polypropylene (PP-A and PP-B) and of their blends in sheet form was studied in air with irradiation doses up to 10 Mrad. The elongation at break (γB) scarcely changed with irradiation dose below a critical value (Dc), but decreased drastically on irradiation a little in excess of Dc. The critical dose (Dc) increased rapidly with increasing amorphous fraction (fa) of the polypropylene, the relationship being expressed by an empirical equation, 33·5. The G values (3·1) for main-chain scission obtained for the irradiation of PP-A and PP-B in air were almost equal. The oxidation yield (Yox), defined as the amount of ketones produced per gram of polymer, depends on both the total dose of irradiation (D) and the amorphous fraction (fa) according to the relationship, 11·4 fa3·0D1·3. On the basis of these results, the important rôle of the amorphous fraction (fa) of polypropylene resin in its resistance to radiation-induced oxidative degradation is discussed.
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