Study of photodegradation in aqueous solutions of a polyamidehydroxyurethan type polymer. The effect of polymer concentration and of flux of the incident radiation

The behaviour of aqueous solutions of a polyamidhydroxyurethan type polymer under irradiation with ultraviolet light was studied. The decrease in visc osity of these solutions was found to depend both on the polymer concentrat ion and on the flux of incident radiation. The number of chain scissions, t he quantum yield of chain scission and the rate of degradation decrease wit h concentration of polymer in solution, at the same values of the incident radiation flux. The chain scissions increase with the flux of incident radi ation, at the same polymer concentrations.