WAVELENGTH SENSITIVITY OF PHOTOOXIDATION OF STYRENE-BUTADIENE-STYRENECOPOLYMER

The wavelength sensitivity of SBS exposed to filtered xenon are radiat ion and sunlight was determined by the sharp cut filter technique base d on the changes in IR absorption and mechanical properties. The spect ral response curves of SBS exposed to both filtered xenon lamp and sun light were similar. They showed that wavelength region, responsible fo r photooxidation of SBS, is in the range of approximately 290-380nm. T he wavelength sensitivity of polystyrene exposed to filtered xenon are radiation was also determined and was different from that of SBS. It is suggested that the wavelength sensitivity of SBS is determined main ly by the polybutadiene component.