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Experimental densities ρ, refractive indices n D, and viscosity η data of the ternary dimethyladipate + tetrahydrofuran + 1-butanol and the binary tetrahydrofuran + 1-butanol systems have been determined, while viscosities have been measured for the binary dimethyladipate + 1-butanol system. The properties ρ, n D, and η are experimentally determined at eight temperatures over the temperature range T = (288.15 to 323.15) K and at atmospheric pressure, using instruments from Anton Paar: digital vibrating tube densimeter DMA 5000, refractometer RXA 156, and SVM 3000/G2 digital Stabinger viscometer. Excess molar volumes V E, deviations of refractive indices Δn D, and deviations of viscosities Δη were calculated from the measured data. The Redlich–Kister equation is used to correlate excess molar volumes, deviations of refractive indices, and viscosities for binary mixtures, while the Nagata–Tamura equation is applied for a ternary mixture. FT-IR studies of the binary constituents of the investigated ternary mixture have also been carried out at T = 298.15 K.

Densities, refractive indices and viscosities of the binary mixtures of dimethyl phthalate (or dimethyl adipate) + tetrahydrofuran have been measured at eight temperatures (288.15 to 323.15 K) and atmospheric pressure. All measurements were performed using an Anton Paar DMA 5000 digital vibrating-tube densimeter, Anton Paar RXA 156 refractometer and Anton Paar SVM 3000/G2 digital Stabinger viscometer, respectively. From the experimental densities, refractive indices and viscosities, the excess molar volumes, V E , deviations of refractive indices, Δn D , and viscosity deviations, Δη, were calculated.

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Excess molar volumes V E , refractive index deviations Δn D , and viscosity deviations Δη of the ternary dimethyladipate + 2-butanone + 1-butanol and binary 2-butanone + 1-butanol systems are determined from the measured densities ρ, refractive indices n D , and viscosities η. Viscosities and viscosity deviations of the binary dimethyladipate + 2-butanone system are also presented. Measurements are carried out at eight temperatures from (288.15 to 323.15) K and at an ambient pressure of 0.1 MPa. Instruments from Anton Paar were utilized: a digital vibrating tube densimeter type DMA 5000, RXA 156 refractometer, and SVM 3000/G2 digital Stabinger viscometer. Excess properties of the binary system were fitted to the Redlich−Kister polynomial equation, whereas for the ternary system, the Nagata−Tamura equation was applied. To try to comprehend the nature of the interactions between compounds that cause nonideal behavior in mixtures, FT-IR spectra of the binary constituents were collected at T = 298.15 K. V E data of the investigated ternary system show both negative and positive deviations from the ideal behavior. On the other hand, viscosity changes are negative, while changes in refractive indices are positive over the entire concentration area at all investigated temperatures.