Studies on excess molar volumes and viscosity deviations of binary mixtures of butylamine and N, N-dimethylformamide with some alkyl acetates at 298.15 K

Abstract

Densities and viscosities have been measured for the binary mixtures of butylamine (BA) and N, N-dimethylformamide (DMF) with methyl acetate (MA), ethyl acetate (EA), butyl acetate (BUA) and <i>iso-</i>amyl<i> </i>acetate (AA) at 298.15 K over the entire composition range. From density and viscosity data, the values of excess molar volume (<i>V^E</i>)<i> </i>and viscosity deviation (Δη) have been determined. These results have been fitted to Redlich-Kister type polynomial equations to estimate the binary coefficients and standard errors between the experimental and computed values. The density and viscosity data have been analyzed in terms of semiempirical viscosity models and the results have been discussed in terms of molecular interactions and structural effects. The excess properties are found to be either negative or positive depending on the molecular interactions and the nature of liquid mixtures.