Effect of Temperature on Ultrasonic Speed and Related Acoustical Parameters of Cardo Polysulfonate of Bisphenol-A and 4, 4’-Disulfonyl Chloride Diphenyl Ether Solutions

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 (κ_a), Rao’s molar sound function(R), Van der Waals constant(b), internal pressure(π), free volume (V_f), intermolecular free path length (L_f), 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 (S_n) suggested structure forming tendency of the polymer.