The thermal stability of highly filled high-density polyethylene quaternary composites : interactive effects and improved measures

Show simple item record Viljoen, Willem David Labuschagne, F.J.W.J. (Frederick Johannes Willem Jacobus) 2020-05-29T08:05:51Z 2020-05
dc.description.abstract A range of formulations — consisting of high-density polyethylene, surface-coated calcium carbonate, masterbatched carbon black and a stabiliser package — were compared in terms of their thermal stability through the use of several techniques and measures. Notably, calcium carbonate loadings of up to 60 wt% were investigated. The formulations were designed to be I- and D-optimal, based on a quadratic Scheffé polynomial model. Novel and established measures for the thermal stability of the materials were compared, based on data generated using techniques for the determination of oxidative induction time and for studies by time-sweep oscillatory rheometry. For ease of comparison, all tests were performed in air. Fourier-transform infrared spectroscopy was performed on the materials subjected to time-sweep oscillatory rheometry, to ascertain the locality and modes of degradation. Variable effects were found, depending on the technique used. Broadly, strong primary effects were found: positive in the cases of the carbon black and stabiliser pack, negative in the case of calcium carbonate. The latter, however, was offset by the highly synergistic interaction of calcium carbonate with the stabiliser pack. Time-sweep oscillatory rheometry was shown to be a promising method, with it yielding high-quality, comparable results when interpreted using a novel measure. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.embargo 2021-05-01
dc.description.librarian hj2020 en_ZA
dc.description.uri en_ZA
dc.identifier.citation Viljoen, W.D. & Labuschagné, F.J.W.J. 2020, 'The thermal stability of highly filled high-density polyethylene quaternary composites: Interactive effects and improved measures', Polymer Testing, vol. 85, art. 106424, pp. 1-13. en_ZA
dc.identifier.issn 0142-9418 (print)
dc.identifier.issn 1873-2348 (online)
dc.identifier.other 10.1016/j.polymertesting.2020.106424
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2020 Elsevier Ltd.. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Polymer Degradation and Stability. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Polymer Degradation and Stability, vol. 85, art. 106424, pp. 1-13, 2020. doi : 10.1016/j.polymertesting.2020.106424. en_ZA
dc.subject Experimental design en_ZA
dc.subject High-density polyethylene en_ZA
dc.subject Highly filled composites en_ZA
dc.subject Oxidative induction time en_ZA
dc.subject Thermal degradation en_ZA
dc.subject Time-sweep rheometry en_ZA
dc.title The thermal stability of highly filled high-density polyethylene quaternary composites : interactive effects and improved measures en_ZA
dc.type Postprint Article en_ZA

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