The photolysis of polyvinylpyrrolidone in oxygen-free aqueous solutions has been investigated as a function of polymer concentration, chain length, light intensity, and temperature. Ultraviolet spectra at various degrees of degradation have been measured. The experimental data can be satisfactorily accounted for by a Norrish type II cleavage of main chain links for ketones in conjunction with a small component of type I chain scission yielding polymer radicals. Recombination of double-bond-ended chains with polymer radicals takes place.
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Jellinek et al. (1968) studied this question.
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