Acoustical and stability studies on polyvinyal alcohol – A biodegradable polymer

Ultrasonic velocity, density and viscosity of the aqueous PVA solutions are measured using the ultrasonic interferometer and Ostwald viscometer respectively at 303 K. The various concentrations of PVA with water are prepared. From the measured parameters, thermo acoustical parameters like adiabatic compressibility, molecular free length, specific acoustic impedance, viscous relaxation time, absorption coefficient, molar volume, free volume and internal pressure are calculated. The magnitude of these parameters shows intermolecular interaction between solute and solvent molecules. The stability constant is determined by Yoshida & Osawa method and Kannappan method which helps in understanding the stability of polymer - ion interactions in the binary mixture. Excess parameters have been calculated and discussed with respect to the type of interaction existing between unlike components. Frequency acoustic spectrum evidences the nature of intermolecular interaction in the system.