Zenjiro Osawa, Fujiko Konoma, Song Wu, Jing-fen Cen
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Photo-oxidative degradation of polystyrene: Comparison of chemiluminescence with other analytical methods
Commercial polystyrene films 0·1 mm and 0·05 mm thick were photo-irradiated in mono- and multi-layer films in air, and several analytical methods—infrared and ultraviolet spectroscopy, chemiluminescence and gel permeation chromatography—have been applied to detect the degree of photo-oxidation of the polymer.
The chemiluminescence method proved to be very sensitive and it was possible to detect very minor amounts of the oxidative defects caused by photo-irradiation of the polymer. The emission intensity increased with increasing photo-irradiation time and thickness of sample films. By analysis of each film after photo-irradiation at various depths from the surface, it was clearly demonstrated that photo-oxidation of the polymer commenced at the surface.
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