Investigating into physical properties of composites of polymer blends and cobalt chloride irradiated by gamma ray for optical devices development

The present work studies the influence of cobalt chloride (CoCl2) and gamma-irradiation dose on the optical, thermal properties, and dynamic mechanical analysis (DMA) of different blends of (PVA/PEG /PVP). Different optical parameters were deduced before and after gamma-irradiation with different doses (5, 10, and 15 kGy). The optical conductivity (sigma optical) values for the prepared blends and composites indicate their importance for optical energy applications, especially after gamma-irradiation. Modifying and enhancing the refractive index of gamma-irradiated samples enables their use in various optical devices. Linear optical susceptibility (chi(1)) and the third nonlinear susceptibility (chi(3)) increased by decreasing the PVA amount in the blend and composites. Thermogravimetric analysis TGA confirmed that by adding CoCl2 to the hosting blends, the thermal oxidative degradation energy Ea became much higher than unirradiated samples. The DMA results show that the storage modulus was significantly improved after adding CoCl2 and after irradiating the samples by 5 and 10 kGy. Also, all the samples exhibited two relaxation temperatures and were greatly affected by adding the filler.