Densities, Viscosities, Refractive Indexes and Excess Molar Volumes of Binary Mixtures (1, 2- Propanediol + 1- Heptanol, or 1 Hexanol) and (1, 2-Ethanediol + 2-Butanol, 2-Propanol ) at various temperatures

Binary systems are an important class of solvents and solutions. Unfortunately, the behavior of some of their properties is still not clear. Especially interesting are highly associated in binary systems. At the same time, interpretation of the mixing effects is extremely difficult because of various possible interactions and size effects. The aim of this work is to study the composition and temperature dependence of volume effects for (1, 2 Ethanediol + 2-Propanol, or 2-Butanol) and (1,2-Propanediol + 1- Heptanol, or 1-Hexanol) systems, i.e., for systems having two strong self-associated hydroxyl compounds. The type and extent of the association is essentially determined by the two components of the alcohol molecule, i.e., the hydrocarbon chain (length and/or degree of branching) and the hydroxyl groups (number and positions). In the mixtures of alcohols, interplay of molecules of the same kind (self-association) and of different kinds (complexation) occurs [1-2]. We have measured the density, viscosities, refractive indexes and excess volumes of the binary mixture (1, 2-Ethanediol + 2-Propanol, or 2-Butanol) and (1, 2-Propanediol +1- Heptanol, or 1-Hexanol) at various temperatures and concentrations.