Resumo

EKEZIE, Chukwuebuka M.; COOKEY, Grace A.  e  MADUELOSI, Jane N.. Volumetric and viscometric studies of binary mixtures of methanol and some alkyl acetates at varying temperatures. S.Afr.j.chem. (Online) [online]. 2023, vol.77, pp.133-137. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2023/v77a16.

The degree of molecular interactions between mixed solvent molecules and thus ideal behavior results from the molecular architecture and chemical nature of component solvents. This understanding is essential in the design and applications of both pure and mixed solvent systems. Density and viscosity measurements of pure and binary mixtures of methanol and n-methyl acetate, n-butyl acetate, and n-pentyl acetate were carried out at different compositions of methanol and temperatures of 25, 30, 35, 40 °C. The experimental data obtained were correlated to the Redlich-Kister equation from where the excess functions; excess molar volumes, excess viscosities, excess Gibbs free energies of activation for viscous flow, fitting coefficients and standard deviations were obtained. The viscosity values were correlated with Hind et al, Kendral and Monroe, Grunberg and Nissan and Frenkel semi empirical models to ascertain the best fit for the systems. The results obtained have been discussed in terms of the structural differences and nature of the interactions between molecules of the mixed solvents.

Palavras-chave : density; excess functions; semi-empirical models; viscosity.

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