Abstract
The acceleration effect of stearic acid on oxidation of polypropylene (PP) has been examined by chemiluminescence (CL). The presence of acid in PP shortens the induction period of CL increase. The effect becomes more pronounced with increasing temperature. The CL curves of oxidation were analyzed in terms of heterogeneous kinetics considering stearic acid–hydroperoxide interaction as an elementary initiating reaction of PP oxidation. A nonlinear Arrhenius plot of experimental induction period of oxidation of PP has been observed in the presence of stearic acid. It was accounted for as an inherent feature of heterogeneous oxidation kinetics.
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