STUDY OF INTERMOLECULAR ASSOCIATION IN BINARY-MIXTURES OF METHYL-ISOBUTYL KETONE (MIBK) AND SOME MONOSUBSTITUTED BENZENES

Dielectric constant (epsilon) of methyl-isobutyl ketone (MIBK), in bin ary mixtures with four monosubstituted benzenes-namely chlorobenzene, bromobenzene, aminobenzene and toluene has been measured at 455 kHz an d at temperature 303.16 K. The data are used to evaluate mutual correl ation factor g(ab), excess molar polarization Delta P and Gibbs's exce ss free energy of mixing Delta G(ab) by Using Winkelmann-Quitzsch equa tion for binary mixtures. The trend of variation of these parameters i ndicate predominance of alpha-clusters with parallel dipolar orientati on of unlike molecules in the mixtures with toluene while in the rest, beta-clusters are dominant.