The viscosities of binary mixtures consisting of ethanol

propanol

ethylene glycol or 1

2-propanediol with N

N-dimethylformamide (DMF) were determined for the whole range of compositions at 288.15-313.15 K under atmospheric pressure by using Ubbelohde viscometer. The excess molar viscosity (△η) and excess Gibbs energy of activation of viscous flow (△G*E) were calculated from the experimental data

and correlated by Redlich-Kister equation. The viscosities of binary mixtures were correlated and predicted with four different expressions (Frenkel

Grunberg-Nissan

Katti-Chaudhari and McAllister model). It has been using the theory of Eyring method to calculate the thermodynamic functions of activation of viscous flow

such as the flow activation free energy

the activation enthalpy and entropy. The results show that both △η and △G*E are negative over the whole mole fraction range in the temperature range studied for all of the binary mixtures

and the deviation is greater as temperature decreases. All the viscosity deviations reached the minimum values at x1(DMF)≈0.3. The three-body McAllister semi-empirical equation was found to be the best correlation to represent the viscosities of all binary mixtures

in which the average relative errors between predicted and experimental data were minimum. The differences of intermolecular interaction between monohydric and dibasic alcohol with DMF were compared and analyzed.