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Authors
Affiliations
1 Department of Chemistry, Polymer Chemistry Division, Saurashtra University, Rajkot-360005, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 34, No 4 (2012), Pagination: 86-89
Abstract
The density (ρ), viscosity (η) and ultrasonic speed (U) (2 MHz) of pure solvents: 1,2-dichloro ethane, chloroform, THF and 1,4-dioxane and copolysulfonate (PSAE) solutions have been investigated at 303, 308 and 3130K. Various acoustical parameters such as specific acoustical impedance (Z), isentropic compressibility (κa), Rao’s molar sound function(R), Van der Waals constant(b), internal pressure(π), free volume (Vf), intermolecular free path length (Lf), classical absorption coefficient (α/f2)cl and viscous relaxation time (τ) have been determined from ρ, η and U data and correlated with concentration at temperature. A fairly good to excellent correlation between a given parameter and concentration is observed at all temperatures and solvent systems studied. Increase or decrease of acoustical parameters with concentration and temperature indicated existence of strong molecular interactions. The effect of temperature, concentration and solvent on acoustical properties is discussed. The positive values of solvation number (Sn) suggested structure forming tendency of the polymer.
Keywords
Ultrasonic Velocity, Density, Viscosity, Acoustical Parameters, Solvation Number, Molecular Interactions.
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