Investigation of Acoustical Parameters of Polyvinyl Acetate

Abstract

In the present paper the ultrasonic velocity (v), density (ρ) and viscosity (η) have been measured for the solutionsof polyvinyl acetate of average molecular weight 45000 approx. in acetic acid at concentration range 0.50% to2.00% and in temperature range 35oC to 55oC respectively. Ultrasonic velocity has been measured using variablepath ultrasonic interferometer at 1MHz frequency. Using above mentioned values of ultrasonic velocity, densityand viscosity, various acoustical parameters like adiabatic compressibility, acoustic impedance, relaxation timeand ultrasonic attenuation have been computed. The variation of adiabatic compressibility (β), acoustic impedance(Z), relaxation time ( ?) and ultrasonic attenuation (α/f2) with concentration and temperature have been studied.Acoustical parameters provide important information in understanding the solute-solvent interaction in a polymersolution.