Viscosities and deviations in viscosity of tert-butanol with n-butylamine, di-n-butylamine and tri-n-butylamine

Viscosities of the systems of tert-butanol (TB) + n-butylamine (NBA), TB + di-n-butylamine (DBA) and TB + tri-n-butylamine (TBA) were determined at the temperatures ranging from 303.l5 to 323.15 K within the composition range 0 ≤ x2 ≤ 1, where x2 is the mole fraction of TB. The viscosity, η increases slowly up to x2 ~ 0.7, beyond which the values increase sharply until that of pure TB is reached. In all systems, deviations in viscosity, Δη show negative values throughout the whole range of composition with minima in the TB-rich region. The magnitudes of the negative values of Δη at the minimum are in the order TB + TBA > TB + DBA > TB + NBA. The negative Δη has been accounted for dispersive force.