Abstract
The excess molar volume V E, the viscosity deviation Δ η and the excess Gibbs energy of activation Δ G ∗E of viscous flow have been investigated from density and viscosity measurements of 15 mixtures of ethanol, propanol, butanol, pentanol, heptanol, octanol and decanol with di- n-propylamine, and di- n-butylamine, and of hexanol with di- n-butylamine over the entire range of mole fractions at 303.15 and 313.15 K. The V E of all the systems are very large negative. Except for the ethanol with di- n-propylamine and di- n-butylamine mixtures, the magnitude of negative deviations in viscosity increases with chain length of alkanol. The results have been explained considering mixed association of alkanol with diamine through OH⋯N bond. The viscosity data have been correlated with the equations of Grunberg and Nissan, Tamura and Kurata, Hind, McLaughlin and Ubbelohde, Katti and Chaudhri, McAllister, Heric, and of Auslaender.
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