Molecular interaction in binary mixtures of 1,4-butanediol+picolines: Viscometric approach

Abstract

The viscosity (<img src='/image/spc_char/Etta.gif' border=0>) of {1,4-butanediol (i) + α-, or β-, or γ-picoline (j)}binary mixtures have been measured and reported at 303.15, 308.15, 313.15 and 318.15 K over the entire range of composition. Viscosity deviation (<em>∆</em><em>η</em>) and excess Gibbs energy of activation of viscous flow (<em>∆G*^E</em>) based on Eyring’s theory have been evaluated and the results fitted to the Redlich-Kister equation. The ∆η values are observed to be negative over the entire range of composition for (1,4-butanediol+α-picoline), (1,4-butanediol+β-picoline) and (1,4-butanediol+γ-picoline) systems. The experimental viscosity data have been compared with some well-known equations of Frenkel, modified Frenkel approach and predictive ones like McAllister, Grunberg-Nissan, Hind <em>et al</em>., Tamura Kurata and Katti-Chaudhri. The effects of molecular sizes and shapes of the component molecules on the molecular interactions present thereof in the mixtures have been discussed.