Study of Thermophysical Properties of Binary Mixtures of 1,4-Butanediol + Cresols at Different Temperatures

Abstract

Density (ρ) and ultrasonic velocity (u) of liquid binary mixtures of 1,4-butanediol (1,4-BD), o-cresol (OC), m-cresol (MC) and p-cresol (PC) have been measured at four distinct temperatures (303.15 K, 308.15 K, 313.15 K and 318.15 K) as a function of composition. Using data, significant thermodynamic and thermophysical parameters viz., internal pressure-IP (πi), free volume-FV (Vf), enthalpy-EH (H), entropy-ET (Ts) and their excess counterparts have been evaluated. The excess parameter functions EFV (VfE), EEH (HE), EFE (GE) and EET (TsE) were observed to be primarily negative, while πiE is positive indicating that the constituent molecules in these mixtures have discernible interactions with one another.