Use of Oxidation Onset Temperature Measurements for Evaluating the Oxidative Degradation of Isotatic Polypropylene |
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| Authors: | José Eduardo Volponi Lúcia Helena Innocentini Mei Derval dos Santos Rosa |
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| Institution: | (1) Institute of Applied Materials, Departments of Chemistry and of Chemical Engineering, University of Pretoria, Pretoria, 0002, South Africa |
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| Abstract: | The widespread use of polymeric materials in many applications requires polymers that are weather resistant. The aim of this study is to examine the usefulness of oxidation onset temperature measurements as a tool for evaluating oxidative degradation of isotatic polypropylene. Differential scanning calorimetry was used to measure the oxidation onset temperature in formulations of isotatic polypropylene containing different concentrations of light and thermal stabilizers after aging in a Weather-Ometer. Oxidation onset temperature gave better results than oxidation induction time for evaluating the degradation of isotatic polypropylene during aging in a Weather-Ometer. However, both tests showed a poor correlation with the appearance of cracks seen by optical microscopy. |
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| Keywords: | Polypropylene oxidation onset temperature oxidation induction time degradation Weather-Ometer |
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