SHEAR VISCOSITIES OF BINARY-MIXTURES OF PYRROLIDIN-2-ONE WITH C-6-C-10 N-ALKAN-1-OLS

Excess viscosities and excess Gibbs energies of activation for viscous flow at five temperatures have been calculated for binary liquid mixt ures of pyrrolidin-2-one with (C-6-C-10) alkan-1-ols from the experime ntal densities and viscosities of the mixed fluids. The excess viscosi ties and excess Gibbs energies of activation were negative, and increa sed with increasing temperature. The fitting of viscosities to the one -parameter (d) Nissan-Grunberg equation, and the two-parameter (v(12) and v(21)) McAllister equation was extended to the C-1-C-5 alkanols us ing earlier results, and examined in terms of interactions between unl ike molecules. The v(12) and v(21) parameters were positive and increa sed with increasing temperature. A minimum in the excess Gibbs energie s and d values at equimolar concentrations of the two components has b een observed for the pyrrolidin-2-one-pentan-1-ol system.