Volumetric and ultrasonic investigation of polyethylene glycols (PEG-200 and PEG-600) in aqueous solutions of sodium methylparaben at various temperatures

In the current work, the apparent molar properties and partial molar properties have been assessed from the measurement of density and speed of sound with the interest to inspect the interconnection of polyethylene glycols viz. PEG-200 and PEG-600 in aqueous solutions of sodium methylparaben at several temperature varying from 293.15 K to 308.15 K and experimental pressure p = 0.1 MPa. The investigation of apparent molar volume (V-phi), partial molar volume (V-phi(0)) and partial molar volume of transfer(Delta V-phi(0)) is performed using density measurements. The data of apparent molar isentropic compression (K-phi,K-s), partial molar isentropic compression (K-phi,s(0)) together with partial molar isentropic compression of transfer (Delta K-phi,s(0)) are attained with the aid of speed of sound measurements. The limiting apparent molar expansibilities (E-phi(0)) along with its first order derivative (partial derivative(0)(phi)/partial derivative T)(p) are also evaluated. Moreover, utilizing McMillan and Mayer theory of liquids, the pair and triplet coefficients are estimated from the experimental data. Through the examination of these computed parameters, the results are illuminated with reference to physicochemical co-solute-solvent association arising in the existing investigated system. (C) 2019 Elsevier Ltd.