AbstractThe ultraviolet spectra of aqueous solutions of polyvinyl alcohol have been examined with a view to identifying the chromophores present. The spectrum may be modified by reduction with hydrogen over Raney nickel at room temperature, which is specific for ethylenic unsaturation, and by reduction with sodium borohydride, which is specific for carbonyl groups. An analysis of the resulting spectra supports the proposal that the ultraviolet absorption of aqueous polyvinyl alcohol solutions arises from polyene‐carbonyl chromophores of empirical formulas: (CHCH)nCO, wherenmay vary fr
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