Fluorescence analysis has been employed as an analytical technique to elucidate the photolysis mechanism of several aromatic diisocyanate‐based polyurethanes in solution. Based on a comparison with model arylmonocarbamates and arylbiscarbamates, the photo‐Fries rearrangement and cleavage‐type products found for the small‐model arylcarbamates were also identified for the photolyzed polyurethanes in solution. Viscosity and absorbance change results for photolysis of both air and nitrogen‐saturated polyurethane solutions are consistent with a general two‐step mechanism for the photolysis of aromatic diisocyanate‐based polyurethanes.
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Hoyle et al. (1986) studied this question.
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