Viscosities of nonelectrolyte liquid mixtures. I. binary mixtures containing p-dioxane |
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Authors: | S L Oswal R P Phalak |
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Affiliation: | (1) Department of Chemistry, South Gujarat University, 395007 Surat, India |
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Abstract: | Viscosity measurements are reported for p-dioxans with cyclohexane, n-hexane, benzene, toluene, carbon tetrachloride, tetrachloroethane, chloroform, pentachloroethane, and ethyl acetate at 303.15 K. Excess Gibbs energies of activation G
*E of viscous flow have been calculated with Eyring's theory of absolute reaction rates. The deviations of the viscosities from a linear dependence on the mole fraction and values of G
*E for binary mixtures have been explained in terms of molecular interactions between unlike pairs. The Prigogine-Flory-Patterson theory has been used to estimate the excess viscosity, ln , and corresponding enthalpy ln
H, entropy ln
S, and free volume ln
v terms for binary mixtures of p-dioxane with cyclohexane, n-hexane, benzene, toluene, carbon tetrachloride, and chloroform. Estimates of excess viscosities from this theory for p-dioxane with benzene, toluene, and carbon tetrachloride are good, while for the other three mixtures they are poor. The local-composition thermodynamic model of Wei and Rowley estimates the excess viscosity quite well even for p-dioxane mixtures with cyclohexane and n-hexane. |
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Keywords: | activation energy aromatic hydrocarbons chloroalkanes p-dioxane molecular interactions viscosity |
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