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, η^E, have been calculated from density and viscosity data. ρ, , η and η^E 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.

Keywords:

• Excess molar volume
• Viscosity
• Cumene
• 1-Propanol
• 2-Propanol
• 1-Butanol
• t-Butanol