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 are calculated from density and viscosity measurements of six mixtures of 1-propanol, 1-butanol, 1-pentanol, 1-heptanol, 1-octanol and 1-decanol with tri- n-butylamine over the entire range of mole fractions at 303.15 and 313.15 K. The values of V E of all six systems are very large and negative. Except for 1-propanol+tri- n-butylamine, the magnitude of negative deviations in viscosity increases with chain length of alkanol. The results have been explained considering mixed associated species of type A i B involving alkanol (A) with tri- n-butylamine (B) through OH⋯N bonds. 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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