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Abstract γ‐Oxidation of linear low‐density polyethylene based on hexene and butene was investigated. Irradiation was performed at different dose rates in air (from 2 rad/s to 100 rad/s). Degraded samples were analyzed with IR combined with NO and SF 4 derivatizations. Our results showed that the lower the dose rate, the higher the degree of oxidation in terms of γ‐product formation. Ketone species appeared to be the dominant γ‐products. The G values of γ‐product formation were very dependent on the dose rate of initiation. Comparison of the G value ratio of different γ‐products revealed stoechiometry differences. The complex appearance and disappearance of unsaturations was tentatively explained. The modifications of elongation at break induced by γ‐irradiation were monitored by molecular changes in weight. This was not conclusive because changes in elongation at break are inconsistent with changes in M w /M n .
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Tidjani et al. (1995) studied this question.
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