Viscometric Studies of Molecular Interactions in Binary Mixtures of Ethylbenzene with (C4 to C8) Alkan-1-ols

Abstract Dynamic viscosities (ηexp) for binary mixtures of ethylbenzene with butan-1-ol, pentan-1-ol, hexan-1-ol, heptan-1-ol, and octan-1-ol were measured at varying temperatures (298.15 to 323.15 K; interval, 5 K) and atmospheric pressure. Viscosity deviations (Δη) across the entire range of mole fractions were derived from ηexp and were correlated using a Redlich-Kister type polynomial expression. The ηexp were compared with those calculated, ηcal, in terms of the pure components and the adjustable interaction parameters derived from ηexp using Arrhenius, Kendall-Monroe, Grunberg-Nissan, Teja-Rice, and Andrade/DIPPR models to evaluate the validity of the predictive and correlative approaches. The temperature-induced variations in ηexp were discussed considering the impact of the increasing chain-length of alkanols, including molecular interactions among the component molecules in the binary mixtures. A computational quantum mechanical modeling approach, density-functional theory, was used to explore the dimensions in interactions among the binary mixture components.