Journal of Pure and Applied Ultrasonics

N. Dharani Rajan ¹, S. Jayakumar ¹, G.M. Rajesh ¹, R. Ravisankar ², G.S. Gayathri ³

Affiliations
1 Department of Physics, RKM Vivekananda College, Mylapore, Chennai-600 004, IN
2 Department of Physics, Govt. Arts College, Thiruvannamalai, IN
3 Department of Chemistry, S. A. Engineering College, Chennai, IN

Abstract

Polyvinyl pyrolidine is a non ionic polymer and it is a protein acceptor. PVP is soluble in water and other polar solvents. Its chemical formula is. PVP is used as binder, stabilizer, adhesive, complexing agent and in resins. Ultrasonic velocity, viscosity and density studies on aqueous solutions of PVP of Molecular Weight 40,000 have been carried out. From the velocity, density and viscosity values, various Acoustical Parameters, specific acoustic impedance, adiabatic compressibility, intermolecular free length, viscous relaxation time attenuation factor, absorption coefficient, internal pressure and free volume have been computed. All these parameters have been discussed to throw light on the polymer solute solvent interaction. The stability constant k is obtained from Yoshida and Oswaa method and Kannappan method. The stability constant of polymer in solution, gives the stability and the nature of interaction. The frequency acoustic spectra (FAS) of ultrasonic waves is determined from low frequency to high frequency. From the frequency Acoustic Spectra the bandwidth of the aqueous polymer solution obtained is 3000 m/s. Lebowitz and Reiss have developed a formulation called scaled particle theory, which has been used to find out radial distribution function. The theory gives a relation between ultrasonic velocity and hard convex spherical molecules, which is used to calculate various parameters like specific heat capacity, packing density, molecular diameter and ultrasonic velocity. The radial distribution function and constant (K, A and B) is determined. These values are compared with standard values. Statistical analysis of ultrasonic velocity in the polymer solution shows the mean value is 1322 4 m/s. The standard deviation of velocity obtained is 42.60. The higher standard deviation the lesser will be the variation in the observation. PVP is amphiphilic in nature. The hydrophilic nature of PVP involves the presence of interaction between carbonyl group and polar solvent.

Keywords

Nonionic, stabilizer, stability constant, scaled particle theory.

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