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In the present study, measurements of experimental density (ρ), viscosity (η) and speed of sound (u) of binary liquid mixtures of 2-methyl-1-butanol with ethylene glycol monomethyl ether, diethylene glycol monomethyl ether and triethylene glycol monomethyl ether have been carried out within the temperature range of 298.15–308.15 K with an interval of 5 K. Using the experimental data, excess properties such as excess molar volume ( V m E ), excess molar isentropic compressibility ( K s , m E ), excess speed of sound ( u E ), deviation in viscosity (Δη) and excess Gibbs free energy of activation for viscous flow ( Δ G * E ) have been calculated to study the intermolecular interactions present in these liquid mixtures. By comparing the standard deviation values the correlation ability of various proposed viscosity models has also been tested. Further, to rationalize the excess volume data Prigogine–Flory–Patterson (PFP) theory has also been studied. [ABSTRACT FROM AUTHOR]

Densities and speeds of sound for the binary liquid mixtures of tri-n-butylamine with three solvents, namely 1-propanol, 1-butanol and 1-pentanol are measured. The measurements were done over the entire composition range at temperatures from 293.15 to 308.15 K with an interval of 5 K and at atmospheric pressure. Experimental data were used to calculate various thermodynamic parameters like excess molar volumes ( V m E ), excess isentropic compressibilities ( κ s E ), deviations in speed of sound ( u D ), apparent molar volumes ( V φ ), partial molar volumes ( V ˉ m ) and excess partial molar volumes ( V ˉ m E ). Intermolecular interactions present in these mixtures were studied with the help of the calculated data. Studies on Fourier-transform infrared spectroscopy were also done to support the conclusions. Redlich–Kister type polynomial was used to correlate the various excess and deviation parameters to the compositions. Further, the Jouyban–Acree model was used to correlate densities and speeds of sound data with the compositions. [ABSTRACT FROM AUTHOR]

• The thermophysical properties of binary mixtures of 2-methyl-1-butanol with alkoxy ethanols viz., 2-ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol. • The values of V m E are negative for all binary mixtures representing the attractive interactions. • Theoretical analysis of V m E has also been done using the Prigogine–Flory–Patterson theory. • All the excess and deviation parameters have been correlated to the composition with the help of Redlich-Kister type polynomial. • Using viscosity data of binary liquid mixtures, various semi-empirical relations of viscosity were tested. Density (ρ), viscosity (η) and speed of sound (u) of pure components and binary mixtures of 2-methyl-1-butanol with alkoxyethanols viz., 2-ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol have been measured over the entire range of composition at different temperatures T = (298.15, 303.15 and 308.15) K. Using the experimental data various thermophysical properties such as excess molar volume (V m E), excess molar isentropic compressibility (K s , m E), excess speed of sound (u E), deviation in viscosity (Δη) and excess Gibb's free energy of activation for viscous flow (Δ G ∗ E ) have been calculated. The excess or deviation properties used to define the molecular interactions between like and unlike components. Further, the values of excess and deviation properties have been fitted to the Redlich-Kister polynomial equation. The measured viscosities have been correlated with various semi-empirical relations such as Grunberg-Nissan, Tamura-Kurata, Hind et al., Katti-Chaudhri, McAllister (three body interaction) model, Heric-Brewer and McAllister (four body interaction) model. Apart from this, Prigogine–Flory–Patterson (PFP) theory is also used for the estimation of V m E values for studied binary mixtures. [ABSTRACT FROM AUTHOR]