SHEAR VISCOSITIES OF THE N-METHYLFORMAMIDE-(C-1-C-10) AND N,N-DIMETHYLFORMAMIDE-(C-1-C-10) ALKAN-1-OL SOLVENT SYSTEMS

Viscosities of some N-methylformamide- and N,N-dimethylformamide-(C-1- C-10) alkan-1-ol binary mixtures have been measured at 298.15 K over t he whole composition range. The excess viscosities and excess Gibbs en ergies of activation for viscous flow, compared with values for other amide-alcohol mixed solvents, suggest that the alcohol size does not p lay a significant role in the mixture behaviour. The alcohol mixtures with aliphatic amides gave heteroaggregates to a greater extent, the l ower the self-association of the pure amides. An analysis in terms of solvent solubility parameters gave good agreement with experimental re sults.