Volume : 3, Issue : 6, June - 2014

Study of Thermodynamical Properties of Aqueous Polyvinyl Pyrrolidone (PVP) Solution

Sugandha V. Khangar, Omprakash P. Chimankar, V. D. Bhandakkar

Abstract :

The propagation of ultrasonic waves and the measurement of their velocity in solutions form an important tool for the evaluation of various acoustical and thermo dynamical parameters which give an insight into the nature of miscibility and molecular interactions in polymer solutions. In the present study, the ultrasonic velocity, density, viscosity measurements have been made in polyvinyl pyrrolidone solution using pulse echo technique at temperature range 288K– 308K at the different concentrations (wt.%) of PVP in water. Thermo– acoustical parameters viz., adiabatic compressibility (βa), acoustic impedance (z), relaxation time (τ), free length (Lf ), isothermal compressibility (βi ), volume expansivity (α), Moelwyn–Hughes parameter (C1 ) and internal pressure have been computed from the experimental data. The nature of polymer solvent interaction and the effect of concentration on the molecular interaction are studied. The nonlinear variations of polyvinyl pyrrolidone in water have been studied. The variation of ultrasonic velocity and other thermo– acoustical parameters shows linear increase or decrease with concentration (wt.%) which suggest compatibility of the polymer in the given solvent.