Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

In this manuscript, we have reported first time the densities, q, speeds of sound, u, and refractive indices nD for pure 1-alkyl-3-methylimidazolium bromide [Cnmim][Br] (n = 4, 6 and 8), poly ethylene glycol 400 and their binary mixtures at 0.1 MPa, covering entire range of compositions and temperature ranges from 293.15 K to 323.15 K. The measured properties have been used to derive excess molar volumes, VE m, excess molar isentropic compressibilities, KEs ;m, and refractive indices deviation, D0nD. The values of VE m, KEs ;m and D0nD have been fitted to Redlich Kister polynomial equation for evaluation of binary coefficients. The variation in excess properties have been discussed in terms of hydrogen bonding and iondipole interaction. The VE m and KEs ;m were largely negative and decrease with increasing temperature and size of alkyl chain of ionic liquid. The D0nD is small negative. The experimental nD of the binary mixtures were predicted by several mixing rules. The experimental VE m were reviewed by Prigogine Flory Patterson (PFP) theory and Extended real association model (ERAS).