Excess molar volumes and viscosities of some alkanols with cumene

Abstract

Densities, ρ, viscosities, η, of the systems, cumene + 1-propanol, +2-propanol, +1-butanol and +t-butanol, have been determined from 303.15 to 323.15 K, with an interval of 5 K. Excess molar volumes, , and excess viscosities, ηE, have been calculated from density and viscosity data. ρ, , η and ηE of the systems have been plotted against the mole fraction of alcohols. Some of these properties and their excess values have been represented satisfactorily by appropriate polynomials. For the systems, cumene + 1-propanol and cumene + 1-butanol, are both positive and negative, but for the systems, cumene + 2-propanol and cumene + t-butanol, positive have been observed for the whole range of composition. The observed volumetric and viscometric properties have been explained by the concepts: (a) dissociation of alkanols in cumene-rich region, (b) partial accommodation of cumene into interstitial positions of 1-alkanols in alkanol-rich region, (c) donor–acceptor interaction between alkanols and cumene and (d) steric hindrance of branched alkanols.