Effects of Adding Coumarin Dye on Physical Properties of Blend (PC-PS) Film


Pure blend Polycarbonate- Polystyrene (PC-PS) and doped blend films with various volume of Coumarin dye were prepared by using the casting method. The absorption and transmission spectra for these films were measured using UV/VIS spectrometer technique in order to assess the type of transition which was found to be an indirect transition. The optical energy gaps of pure PC was 4.24 eV, pure PS was 4.39 eV, Coumarin dye was 4.08 eV, and the pure blend was 4.1 eV. After doping blend with Coumarin dye, the energy gap was decreased by 0.06 eV in a volume of 12 ml. The results showed that the absorption coefficient and energy band gap are affected by doping. When the Coumarin dye was added to the pure blend with different concentrations (12, 24, 36, and 48) ml, the FTIR spectrum was affected by the disappearance of peaks and appearance of new ones.