ACOUSTICAL STUDIES OF COPOLYMER OF P-HYDROXY BENZOIC ACID AND FORMALDEHYDE IN N, N-DIMETHYL FORMAMIDE AND DIMETHYL SULFOXIDE BY ULTRASONIC VELOCITY MEASUREMENTS
Keywords:Molecular interaction, Acoustical parameters, Solute-solvent and Solute-Solvent interactions, Internal pressure
The density (Ï), viscosity (Î·) and ultrasonic speeds (U) of copolymer of p-hydroxy benzoic acid and formaldehyde in dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) solutions have been investigated to understand the effect of substituent's on intermolecular interactions at 283K, 288K, 293K, 298K, and 303K. Various acoustical parameters such as adiabatic compressibility (Î²), intermolecular free length (Lf), acoustical impedance (Z), internal pressure (Ï€), relaxation time (Ï„) and relative association (RA) were determined and correlated with concentration (C). A good correlation between a given parameter and concentration is observed at all temperatures and solvent systems studied. The results have been used to discuss the nature and strength of intermolecular interactions in the system.
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