Characterization of a cellulose trisphenylcarbamate/1-octyl-3- methylimidazolium tetrafluoroborate mixture as GC stationary phase: Thermodynamic parameters and LSER methodology

摘要

A novel cellulose trisphenylcarbamate/1-octyl-3-methylimidazolium tetrafluoroborate [CTPC/[OcMIM]BF_4] gas chromatographic stationary phase was prepared and characterized utilizing thermodynamic parameters and LSER methodology. The results revealed that the interaction model of each probe molecule on the CTPC/[OcMIM]BF4 stationary phase was invariable within the temperature range studied because of an excellent linear relationship between lnk and 1/T for each probe molecule. The chromatographic retentions of all probe molecules on the CTPC/[OcMIM]BF_4 stationary phase were enthalpy-driven processes. The main interaction forces of the stationary phase with probe molecules are hydrogen bonding interactions, dispersive interactions and dipole-dipole interactions. Moreover, the contribution of each interaction is in the order of hydrogen bonding interaction > dispersive interaction > dipole-dipole interaction. The mixture of CTPC and [OcMIM]BF_4 used as capillary gas chromatography stationary phase had high column efficiency and good film-forming ability, which was suitable for the separation of both nonpolar and polar compounds. Particularly the separation efficiencies of aromatic amines on CTPC/[OcMIM]BF_4 are superior to those on the commercial SE-54 column.