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Oxidation induction time and oxidation onset temperature of polyethylene in air

Testing Gimzewski’s postulate

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Abstract

Oxidation induction times (OIT) and oxidation onset temperatures (OOT) of a low density polyethylene melt were evaluated in air using DSC. Good regression fits to OOT data were obtained using global values for the activation energy (E) that are specific for each antioxidant but assumed independent of concentration. Gimzewski’s postulate that OIT and OOT correspond to the same level of antioxidant depletion was tested by attempting to predict OIT values from OOT generated model parameters. The deviations between predicted and experimental OIT values were comparable in magnitude to the inherent scatter in the data. However, regression of the dynamic OOT data yielded statistically significant lower values for the activation energy than are obtained by direct regression of isothermal data.

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Acknowledgements

Financial support for this research, from the Institutional Research Development Programme (IRDP) and the THRIP program of the Department of Trade and Industry and the National Research Foundation of South Africa as well as Xyris Technology CC, is gratefully acknowledged.

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Authors and Affiliations

  1. Institute of Applied Materials, Departments of Chemistry and of Chemical Engineering, University of Pretoria, Pretoria, 0002, South Africa

    Walter W. Focke & Isbe van der Westhuizen

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  1. Walter W. Focke
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  2. Isbe van der Westhuizen
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Correspondence to Walter W. Focke.

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Focke, W.W., van der Westhuizen, I. Oxidation induction time and oxidation onset temperature of polyethylene in air. J Therm Anal Calorim 99, 285–293 (2010). https://doi.org/10.1007/s10973-009-0097-1

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  • DOI: https://doi.org/10.1007/s10973-009-0097-1

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