The detrimental yellowing of aromatic polyurethanes by irradiation may be accounted for by two mechanisms based on the formation of different photo‐products. The first is observed at short wave lengths and proceeds through a photo‐Fries type reaction; the second mechanism is observed at longer wave lengths and involves quinoidic structures derived from primary hydroperoxides. These two paths may be differentiated by incorporation of well‐known additives into the polymer or by selection of various irradiation wave lengths.
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Gardette et al. (1982) studied this question.
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