Volumetric and Viscometric Properties of Aqueous Solutions of<i>N</i>-Methylformamide, 1,2-Diaminopropane and 2-Methylpropane-2-ol

Abstract

Density and viscosity of aqueous solutions of N-methylformamide (NMF), 1,2-diaminopropane (DAP) and 2-methylpropane-2-ol (MPL) have been measured precisely over the entire composition range (i.e., 1 ≥ x 2 ≥ 0) at five equidistant temperatures ranging from 298.15 to 318.15 K. Excess molar volume (VE m ) and excess viscosity (η E ) have been calculated from measured density and viscosity data, respectively. Excess molar volume and excess viscosity have been fitted by the least squares method to the four parameters Redlich-Kister equation. The results have been interpreted on the basis of (i) interstitial incorporation, (ii) breakdown of the structure of pure liquids, (iii) hydrophobic hydration, (iv) hydrophobic interaction and (v) association between dissimilar liquids.