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Lookup NU author(s): Sudesh Fernando,
Professor Paul Christensen,
Dr Terry Egerton,
Emeritus Professor Jim White
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In situ infrared (FTIR) spectrometry has demonstrated that more CO2 is photogenerated from polypropylene (PP) than from polyethylene (PE) films. Potential applications of the method include investigation of polymer degradation mechanism and ranking of polymer photo-stabilities in as little as 3 h. This study focuses on clarifying the mechanism of this rapid CO2 formation from PE and PP, and complementary insight was obtained from changes in the IR transmission spectra of films irradiated by UVA for hundreds of hours. A 30 min induction time observed for CO2 photogeneration from PP, but not PE, was reflected, on a much longer time scale, in the induction time for carbonyl development in PP, but not PE. This suggests that, in PP, the CO2 induction time is a consequence of the slow development of carbonyl groups, a hypothesis that is supported by the elimination of the PP induction time when, prior to the CO2 measurements, films are pre-exposed to UVA, to generate carbonyl groups. In addition, more CO2 is evolved from both PE and PP films if they are pre-exposed. © 2007 Elsevier Ltd. All rights reserved.
Author(s): Fernando SS, Christensen PA, Egerton TA, White JR
Publication type: Article
Publication status: Published
Journal: Polymer Degradation and Stability
Print publication date: 01/12/2007
ISSN (print): 0141-3910
ISSN (electronic): 1873-2321
Publisher: Elsevier Ltd
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