DENSITY AND VISCOSITY MEASUREMENTS OF AQUEOUS SOLUTIONS OF 2−METHOXYETHANOL AT TEMPERATURES

Abstract

Densities and viscosities have been measured for the binary mixtures of 2–methoxyethanol (2–ME) and water at 298.15, 303.15, 308.15 and 313.15 K. From the precise density measurements, the excess molar volume (EV) were calculated, VE results are negative over the entire range of mole fractions and become less negative as the temperature increases. The deviation in viscosity (Δη) and excess molar Gibbs free energy of activation of viscous flow (ΔG*E) have been calculated from experimental viscosity measurements at different temperatures. Δη and ΔG*E data are positive over the whole mole fraction range.The observed results of VE, Δη and ΔG*E are discussed in terms of molecular interactions in these binary mixtures. Generally, molecular interactions dominant these behaviors are of type, disruption and formation of intra–and interhydrogen bonding between like and unlike molecules, respectively and dipole–dipole interaction. The experimental excess functions VE, Δη and ΔG*E were fitted to the Redlich–Kister polynomial equation to evaluate the adjustable parameters and standard deviation from ideality.