Study of solute–solvent interaction in the solutions of PVA with PEG at 338 K by ultrasonic technique

Abstract

The implementation of low Intensity ultrasound in polymer system acts as a dynamic mechanical deformation. It can be widely used to observe the variations in chemical and physical phenomenon related to change in the visco-elastic behavior. The velocity of ultrasound is related to the density and polymer storage modulus whereas the absorption of ultrasonic wave is connected with energy dissipation in the polymers. Frequently the technique is used in association with rheological methods as a medium of proffer a better understanding about the visco-elastic behavior of polymer materials. The aim of this paper is to study of solute–solvent interaction in the solution of polymer polyvinyl alcohol(PVA) andpolyethylene glycol(PEG) mixed with double distilled water have been done. The mixtures of samples such as Poly Vinyl Alcohol (PVA), Poly ethylene glycol (PEG) and DD water have been prepared at different concentrations. The solution has been magnetically stirred to find homogeneous solution. The Ultrasonic velocities, densities and viscosities are measured at 338 K by using the ultrasonic Interferometer, specific gravity bottle and Oswald viscometer respectively. The ultrasonic waves of two different frequencies such as 2 MHz and 5 MHz have been used. Depending upon the various data obtained, the different acoustical parameters such as adiabatic compressibility, intermolecular free length, acoustic impedance, relaxation time, ultrasonic attenuation coefficient (α/f2) have been evaluated. The obtained results have been discussed in detail and it has been observed that these results are very much helpful in describing the complete molecular interaction in the present sample. The observed variations in acoustical parameters show that all these parameters increase by increasing of the polymer concentration except of adiabatic compressibility and intermolecular free length.