Abstract
Poly(vinyl alcohol) (PVA) quenches excited uranyl ions via a dynamic process, which is suggested to involve hydrogen atom transfer. The quenching behaviour was analysed by a multi-equilibrium model, and shows a pH dependence. At pH 3, photolysis of aerated aqueous solutions of uranyl nitrate and PVA leads to polymer chain scission and uranium(V) formation. At lower pH values, uranium(IV) is formed by disproportionation. With degassed solutions, photo-oxidation of polymer is observed without significant chain scission. On photolysis of degassed solutions of PVA and uranyl ions in the presence of acrylamide, there is evidence for graft copolymerization.
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