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Densities and viscosities of the binary mixtures consisting of  tetrahydrofuran (THF), 1,3-dioxolane (1,3-DO) and 1,4-dioxane (1,4-DO) with  N,N-dimethylformamide (DMF) over the entire range of composition were  measured at temperatures 298.15, 308.15 and 318.15 K and at atmospheric  pressure. Ultrasonic speeds of sound of these binary mixtures were measured  at ambient temperature and atmospheric pressure (T = 298.15 K and P =  1.01×105 Pa). The various experimental data were utilized to derive excess  molar volumes (VmE), excess viscosities (ηE), and excess isentropic  compressibilities (κsE). Using the excess molar volumes (VmE), excess partial  molar volumes (and ) and excess partial molar volumes at infinite dilution  (and ) of each liquid component in the mixtures were derived and discussed.  Excess molar volumes (VmE) as a function of composition at ambient  temperature and atmospheric pressure were used further to test the  applicability of the Prigogine-Flory-Patterson (PFP) theory to the  experimental binaries. The excess properties were found to be either negative  or positive depending on the nature of molecular interactions and structural  effects of liquid mixtures. Em,1V Em,2VE0,m,1VE0,m,2V

Thermophysical properties of binary mixtures of N,N-dimethylformamide with three cyclic ethers