A.J. Kemeakegha¹, I.P. Ejidike^2,*, A.A. Abia¹ and E.D. Dikio²

¹Department of Chemical Sciences, University of Port Harcourt, Port Harcourt, Rivers State, Nigeria

²Applied Chemistry and Nanoscience Laboratory, Department of Chemistry, Vaal University of Technology, Vanderbijlpark, 1911, South Africa

*Corresponding author: E-mail: destinedchild12@gmail.com; ikechukwue@vut.ac.za

Kinematic viscosities (n) of binary mixtures of ethyl acetoacetate (EAA) + aliphatic ketones (C₄-C₉) have been determined as a function of composition at 298.15 K. The dynamic viscosity (η), excess viscosity and excess Gibbs free energy of activation for viscous flow, (ΔG^*E) were also calculated. Excess viscosities (η^E) and excess Gibbs free energies of activation for viscous flow (ΔG^*E) were calculated from the experimental viscosity data and were fitted to a Redlich-Kister type polynomial. The excess viscosity shows negative deviations over the entire range of solvents composition for the mixtures of (ethyl acetoacetate) + butan-2-one, hexan-2-one, heptan-2-one, octan-2-one and nonan-2-one and a positive deviation for the binary mixtures of ethyl acetoacetate + pentan-2-one system. The (ΔG^*E) were all positive over the entire range solvents composition for the binary mixtures. The experimental results were used to test some semi-empirical equations to correlate viscosity-composition data.

Binary mixtures, Intermolecular interactions, Excess viscosities, Activation energies.