Protection of isotactic poly(1-butene) at low temperature against ultraviolet irradiation

The photodegradation and stabilization of isotactic poly(1-butene) at 2537 Å in the presence and absence of 3-hydroxy-1,3-diphenyl triazine N-oxide (HPTO) were examined by light scattering and spectrophotometric techniques. The data have been processed to yield the heats of activation for the system. Monochromatic quantum yields of the photolysis of the polymer films in the temperature range 233–333 K were calculated. The inhibitive action and the optimum concentration of HPTO are discussed from the view point of the molecular weight change and the carbonyl and hydroperoxide contents. The incorporation of 0.7% of HPTO in the matrix of polymeric film afforded complete protection to the polymer from actinic deterioration.