Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 99: Issue 1
Oxidation induction time and oxidation onset temperature of polyethylene in air
Testing Gimzewski’s postulate
Authors:
Walter Focke University of Pretoria Institute of Applied Materials, Departments of Chemistry and of Chemical Engineering Pretoria 0002 South Africa

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Isbe van der Westhuizen University of Pretoria Institute of Applied Materials, Departments of Chemistry and of Chemical Engineering Pretoria 0002 South Africa

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Pages:
285–293
Online Publication Date:
10 Jun 2009
Publication Date:
01 Jan 2010
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-009-0097-1
Keywords:
Accelerated ageing; Antioxidant; Oxidation induction time; Polyethylene
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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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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