Excess molar volumes of binary mixtures of an isomer of pentanol +n- methyl morpholine an interpretation in terms of the prigogine-flory- patterson theory

Abstract EN

The results of measurements of excess molar volumes VE at 298.15 K over the whole mole fraction range for five mixtures (N-methylmorpholine + 2-pentanol ; + 3-pentanol ; + 3-methyl-1-butanol ; + 2-methyl-1-butanol ; and 2-methyl-2-butanol) are presented.

The experimental values of VE show a negative deviation from ideal for the five sets of binary mixtures in except VE values for mixtures of (Nmethylmorpholine + 2-pentanol ; and 3-pentanol) showes two structural regions.

The first is positive at mole fraction 0 X2 0.25.

The second region is negative at mole fraction 0.25 X2 1.

The negativity of VE increases in the order 2-methyl-2-butanol > 2-methyl-1-butanol > 3-methyl-1-butanol > 3-pentanol > 2-pentanol.

The experimental results of VE are compared with those predicted by the Prigogine- Flory-Petterson theory.

The theory poorly predicts the experimental VE.

The experimental value of excess molar volumes VE were fitted to the Redlich-Kister polynomial equation to derive the binary adjustable parameters and the standard deviations. The results obtained are used to study the nature of molecular interactions in these mixtures.

As far as we know, in the open literature, no study on mixtures containing N-methylmorpholine.