Thermodynamics Research Center / ThermoML | Thermochimica Acta

ABSTRACT

The dielectric constants and excess dielectric constants in non-polar + polar binary liquid mixtures oftoluene with alkanols (methyl alcohol, ethyl alcohol, propyl alcohol and isopropyl alcohol) have beenstudied at 303, 313 and 323 K temperatures and over the complete mole fraction range. The dielectricconstants for these mixtures were measured using a microcontroller based system. The results are neg-ative over the entire range of composition. Symmetrical curves were observed for the systems in whichthe minimum occurs approximately at 0.5-mole fraction of toluene. The results are discussed in terms ofintermolecular interactions. In order to predict the dielectric data for non-polar + polar binary liquid mix-tures, five mixing rules were applied and the results indicate that the predictions of the five mixing rulesare satisfactory. The investigation of dielectric constant of mixed solvents bearing alcohols aims at bettercomprehension of their biological, chemical, pharmaceutical, technological and laboratory applications.