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This article describes a new approach to improve the analysis of the chemical modifications that result from the degradation of polymers under UV–visible light exposure in the presence of oxygen. The tool which is used consists of an irradiation chamber whose atmosphere is composed of 18 O 2 . The 18 O 2 pressure inside the chamber and the hygrometry can be adjusted...
FTi.r. studies of the photooxidation of aromatic diisocyanate (MDI) based polyurethanes are presented. The results obtained show that the photochemical evolution of the aromatic moieties involves a dual mechanism: one is a photo-Fries type reaction whereas the other results in an induced oxidation of the central methylene group of MDI. Direct evidences that these reactions occur are obtained on...
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