Analytical performances of two liquid crystals and their mixture as stationary phases in capillary gas chromatography.

Abstract Comparative gas chromatographic applications of two new liquid crystals called LC a and LC b and their equimolar mixture LC a + b were investigated. The thermal properties of LC a , LC b and LC a + b were established with differential scanning calorimetry (DSC) and polarizing microscopy. Differential scanning calorimetry of LC a + b showed that the melting or clearing temperature was intermediate between the corresponding temperatures of the pure compounds. Polarizing microscopy showed that the liquid crystal phase of A + B was nematic. The chromatographic separation abilities LC a , LC b and LC a + b were studied using fused silica capillary columns. Interesting analytical performances were obtained: isomeric separation of aromatics, polyaromatics, phenols.