LAUSR

Abstract Densities and surface tensions of binary mixture of 1,2-diethoxyethane(DEE) and toluene have been measured over the entire composition at four temperatures of 293.15, 303.15, 313.15 and 323.15 K and atmospheric pressure. The trends in measured densities and surface tensions with respect to composition and temperature are discussed in detail and provide complementary information to each other. Excess molar volumes VE and surface tension deviations Δσ of the mixtures are directly calculated from experimental results and well correlated using the Redlich–Kister polynomial equation, which provides a simple tool for interpolation of these properties with fairly high accuracy. Other thermodynamic properties of partial molar volumes, thermal expansion coefficients, surface entropy and enthalpy are also calculated. The sign and magnitude of these quantities are discussed in terms of the nature of intermolecular interactions present in binary mixtures. The negative excess volume properties suggest that the formation of hydrogen bonds between DEE and toluene molecules and the geometrical packing effect are most likely to give rise to the volume contraction during mixing. The surface tensions of the mixture at all temperatures exhibit negative aneotropies and negative Δσ, which is considered as the outcome of intermolecular interactions between DEE and toluene and the prevalent adsorption of toluene at surface, according to the molding results derived using the Extended Langmuir equation.