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 (?E), and excess isentropic
compressibilities (?sE). 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
