Intermolecular investigation of polyethylene glycols with butyl paraben in methanol medium attributing volumetric, ultrasonic and thermo-physical properties

Abstract

This study brings about the investigation of molecular interaction between polyethylene glycols of molecular weight 200 and 600 in methanol butylparaben solution in temperature range T = 293.15, 298.15, 303.15, and 308.15 K and experimental pressure, p = 0.1 MPa. The consequence of concentration and temperature on methanol phase associations were estimated with the help of density and sound velocity measurements. Other physical parameters such as apparent molar volume (Vϕ), apparent molar isentropic compression (Kϕ, s), limiting apparent molar volume (Vϕ0), and limiting apparent molar isentropic compression (Kϕ, s0) were determined from the experimentally measured data. The Kϕ, s0 develop negative value which recommends the superiority of solute intrinsic contractility upon solvent intrinsic contractility. The positive limiting apparent molar expansion (Eϕ0) infers the pre-eminence of solute-solvent associations over solute-solute association in the inspected mixture. The isentropic compressibility (ks) accumulates with upsurge in temperature for the present ternary mixture.