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The induction period for the autoxidation of polypropylene increases with increasing sample thickness (from 1 to 75 mils) and with decreasing oxygen pressure. The rate of oxidation shows the opposite dependences. In contrast, neither the rate nor the induction period in well stirred oxidations of squalane is oxygen pressure‐dependent. It is concluded that autoxidation of polypropylene is controlled by diffusion of oxygen into the sample.
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Boss et al. (1966) studied this question.
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