Document Type : Original Article
Department of Applied Chemistry, Faculty of Science, Malayer University, Malayer, Iran
In this article, using the structural parameters called the concentration-concentration fluctuation factor in the long wavelength limit, the number-number factor in the long wavelength limit, the partial number-mole fraction structural factor, the mixed structural factor in the long wavelength limit and calculating the short order factor Chemical field, we have studied the structure and relative investigation of interactions in binary mixtures including butyl acetate and normal alcohols (1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol) at a temperature of 298.15 degrees. Using the experimental values of molar volume and compressibility coefficient of the mixtures, the mentioned structural parameters were calculated. The effect of increasing the length of the alcohol chain on the mentioned parameters was studied, and using the obtained results, a discussion was made about the regularization or disorder of the solutions. The experimental values of the additional molar volume for all the mentioned systems are positive and increase with the increase of the length of the alcohol chain. The analysis of the mentioned structural parameters for binary mixtures also led to similar results for the strength of bonds and the amount of disorder in them. In general, it can be concluded that the intermolecular bonds in two-component systems containing butyl acetate and normal alcohols are weak, and the amount of disorder in these solutions is greater than the amount of disorder in ideal solutions, and this disorder increases with the increase in the length of the alcohol chain. The increase of these irregularities, which is caused by the weakening of the bonds in the solution, can be considered as a result of the spatial hindrance caused by the non-polar chain of alcohols. With the increase in the length of the chain, the amount of this spatial hindrance also increases.