Thermoacoustical Properties of PEG With Alkoxy Ethanols

The ultrasonic velocity, density and viscosity of binary mixtures of 2-butoxyethanol with PEG200 and PEG 400 were measured at 293, 303 and 313 K over the entire range of composition. Using these experimental data, various thermo-acoustic parameters such as deviation in isentropic compressibility (Δk_s), excess molar isentropic compressibility (K^E_s), excess molar volume (V^E_m) , and molar refractive deviation (ΔR_m) have been calculated and fitted to Redlich-Kister polynomial equation. The deviation / excess parameter were plotted against the mole fraction of 2- butoxyethanol over the whole composition range. The values of (ΔK_s), (V^E_m) and (ΔR_m) are found to be negative and constantly become more negative for mixtures with PEG 400 independently of the solvents. The partial molar isentropic compressibility and excess partial molar isentropic compressibility at infinite dilution have been evaluated. The results of partial molar isentropic compressibility at infinite dilution supports the presence of strong intermolecular interactions between unlike molecules and more pronounced interaction in the mixture of 2-butoxyethanol with PEG 400. The results of density, ultrasonic velocity and refractive index measurement were also fitted to a second order polynomial equation with respect to mole fraction of 2-butoxyethanol.