N,N-Dimethylformamide–2-methoxyethanol solvent system. Densities and excess molar volumes at various temperatures

Abstract

Densities (ρ) have been measured for N,N-dimethylformamide (1), 2-methoxyethanol (2), and for nine binary mixtures covering the whole miscibility field (0 ⩽X₁⩽ 1) in the temperature range –10–+80 °C. The experimental data were used to test some empirical equations of the type ρ=ρ(t), ρ=ρ(X₁) and ρ=ρ(t, X₁). Furthermore, the excess volumes (V^E) for these binaries have been examined and discussed at all the investigated temperatures in terms of the influence of interactions between unlike molecules.

The V^Evs. X₁ plots suggest the presence of some stable adducts, having N,N-dimethylformamide: 2-methoxyethanol stoichiometric ratios of 1 : 2 and 1 : 1 depending on the temperature.