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Lookup NU author(s): Professor Paul Christensen,
Dr Terry Egerton
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Infrared spectrometric measurements have been used to measure the amount of carbon dioxide generated by UVA irradiation of polypropylene film stabilized with 0.5% of three different hindered amine light stabilizers (HALS). The measurements were made in situ, using a specially constructed glass cell fitted with CaF2 windows. In each case the amount of photogenerated carbon dioxide was less than that from a HALS-free polypropylene film of similar thickness. The amount of photogenerated CO2 was greatest in oxygen that had been pre-saturated with water and the amount of CO2 evolved depended on the grade of HALS. In dry oxygen, although the differences between the films containing different HALS were much reduced the amount of CO2 continued to be smaller than that from the HALS-free polymer. The sensitivity of CO2 photogeneration to the presence of HALS provides new evidence of the relevance of the CO2 photogeneration method to the diagnosis of photosensitivity of polymers and the influence of stabilizing additives. (C) 2009 Elsevier Ltd. All rights reserved.
Author(s): Christensen PA, Egerton TA, Fernando SS, White JR
Publication type: Article
Publication status: Published
Journal: Polymer Degradation and Stability
ISSN (print): 0141-3910
ISSN (electronic): 1873-2321
Publisher: Elsevier Ltd
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