Thermo physical and FT-IR study on binary mixtures of 2-isopropoxy ethanol and alcohols at different temperatures

Abstract

As a continuation to our investigations on thermodynamic properties of binary mixtures of alkoxy alkanols with alcohols, the present paper reports the experimental data for the densities, speeds of sound and viscosities for the binary mixtures of 2-isopropoxy ethanol with alcohols. Densities and speeds of sound of 2-isopropoxy ethanol (CH3)2CH2OC2H4OH and alcohols namely1-hexanol C6H14O, 1-octanol C8H18O and 1-decanol C10H22O and their binary mixtures with 2-isopropoxy ethanol as a common component have been measured over the full range of composition at atmospheric pressure and at different temperatures 293.15, 298.15, 303.15, 308.15 and 313.15K and viscosities have also been measured at 298.15, 303.15 and 308.15K over the full range composition. The experimental data were used to calculate the values of excess molar volumes VmE, deviations in isentropic compressibility Δκs, deviations in speed of sound Δu, deviations in viscosity Δη and excess Gibbs free energies ΔG∗E at all mole fractions of (CH3)2CH2OC2H4OH. The observed variations of these parameters with composition and temperature are discussed in terms of the molecular interactions due to physical and chemical effects between the unlike molecules of the binary mixtures. Further, experimental densities were used to estimate partial molar volumes V¯m,1, excess partial molar volumes V¯m,1E and their limiting values at infinite dilution V¯m,i∞ and V¯m,iE,∞, respectively. These parameters, especially excess functions are found to be quite sensitive towards the intermolecular interactions in liquid mixtures. The excess functions and deviations have also been correlated using Redlich-Kister type polynomial equation by the method of least-squares for the estimation of the binary coefficients and the standard errors. A study of above discussed parameters is used to throw light on the interactions existing between the constituents of the binary mixtures. FT-IR technique has been used to scrutinize the –OH interactions between the binary mixtures and is very valuable to spot the influence on the structural variation in the alcohols.