Role of binary solvent mixture on luminescence characteristics in highly miscible PVA/PVP polyblends
Present work investigates the role of binary solvent mixture (DMSO/water) on optical and luminescence properties of spin coated polyvinyl alcohol (PVA)/polyvinyl pyrrolidone (PVP) (40:60) polyblends. The polymer blends were characterized by using scanning electron microscopy (SEM), UV-visible and photoluminescence spectroscopic techniques. The SEM micrographs show homogeneous surface morphology for DMSO/water (60:40) solvent mixture as compared to those solvated with either solvent. No appreciable change in the optical gap of polyblends was observed while the luminescence intensity was observed to increase at 422.7 nm for DMSO/water (60:40) solvent mixtures. These results may be ascribed to enhance the miscibility due to change in relative dielectric constant of DMSO/water solvent mixtures to favor compatibility for polymers. The change in microstructure of polymer blends is very important for developing new optoelectronic and electrolytic devices.