EFFECT OF GAMMA-IRRADIATION ON THE PROPERTIES OF COLORED VINYL-CHLORIDE METHYLMETHACRYLATE COPOLYMER

The effect of different doses of gamma irradiation (3-18 Mrad) on the infrared spectra, spectral absorption in the visible region and viscos ity of the known coloured sample of vinyl chloride-methylmethacrylate copolymer were studied. The atomic absorption measurements for element al analysis revealed that the sample contains Ni, Co and Cr. The irrad iation of the sample with gamma ray doses produced various changes in the IR spectra. The effect of irradiation was monitored by measuring t he spectral absorption in the range 300-700 nm. Three bands appeared s howing variation in intensity and wavelength with increasing irradiati on doses. The intrinsic viscosity of the initial and irradiated sample s was also measured.