The polymer blend solutions of polyvinyl chloride/polystyrene and polyvinyl chloride/cellulose acetate in common solvent have been prepared in different percent of the components. The ultrasonic velocity, viscosity and refractive index have been measured at 30 degrees C The interaction parameters have been computed using the viscosity data to probe the miscibility. The obtained revelations have been confirmed by the ultrasonic velocity and refractive index data
