Ultrasonic study of molecular association of poly(vinyl chloride) solution in tetrahydrofuran

Abstract

Ultrasonic absorption, velocity, adiabatic compressibility, relaxation time and relaxation amplitude measurements are reported on poly(vinyl chloride) (PVC) solution in tetrahydrofuran (THF) using pulsed ultrasonic apparatus operating at 2 MHz and 313 K. Results show a linear increase of velocity. density, viscosity, absorption coefficient, relaxation time and relaxation amplitude values with the increase of PVC concentration in THF. In contrast the compressibility decreases with increasing PVC concentration. This suggests interaction between PVC and THF molecules.

Ultrasonic study of molecular association of polystyrene solutions in benzene

“…Ultrasonic attenuation data were obtained using the pulsed ultrasonic technique; the method of measurements has been described elsewhere [12]. The accuracy of the ultrasonic velocity measurements is f0.5y0.…”

Molecular Interaction Studies on Poly(vinyl chloride) in Chlorobenzene by Acoustic Method

“…Such an effect has been reported for PVC in Tetrahydrofuran. 1 At high solute concentrations, polymer chains interweave and centres are formed owing to strong van der Waals' polar bonds or hydrogen bonds. Temporary van der Waals' bonds in a polymer lattice are formed and disrupted at higher temperatures due to thermal motion.…”