Surface and bulk aspects of the natural and artificial photo-ageing of Bisphenol A polycarbonate as revealed by ESCA and difference UV spectroscopy

ESCA and difference uv spectroscopy have been used to monitor the changes in surface and bulk chemistry, respectively, of Bisphenol A polycarbonate during natural and artificial weathering. It is shown that photo-oxidation, and not a photo-Fries rearrangement mechanism, is the predominant process in...

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Bibliographic Details
Published in:Polymer degradation and stability 1984, Vol.8 (4), p.195-211
Main Authors: Clark, D.T., Munro, H.S.
Format: Article
Language:English
Subjects:
Ageing
Applied sciences
Exact sciences and technology
Physical properties
Polymer industry, paints, wood
Properties and testing
Technology of polymers
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Summary:ESCA and difference uv spectroscopy have been used to monitor the changes in surface and bulk chemistry, respectively, of Bisphenol A polycarbonate during natural and artificial weathering. It is shown that photo-oxidation, and not a photo-Fries rearrangement mechanism, is the predominant process in the surface regions for both types of exposure. For a close correlation with natural weathering the use of a black lamp as an artificial uv source is advocated. Difference uv spectra obtained for natural and black lamp exposures reveal that changes in bulk chemistry cannot be interpreted in terms of a photo-Fries reaction.
ISSN:0141-3910
1873-2321
DOI:10.1016/0141-3910(84)90018-1