ABSTRACT
The general term “chromatography” is used for separation processes relying on the relative movement of two phases, one stationary (solid in adsorption chromatography or liquid in partition chromatography) and the other mobile. Hildebrand parameters have been applied to the evaluation of chromatographic phases. In general, cohesion parameters have proven useful in the characterization of chromatographic materials and in the description or correlation of retention, but they have had limited success in the prediction of retention. An important aim in planning any type of chromatographic separation is the estimation of solvent strength and solvent selectivity. Liquid-solid chromatography, or adsorption chromatography, results in eluotropic series of liquids which are much less sensitive to sample type than in liquid-liquid chromatography. Polymers and plasticizers and their interactions with liquids may be studied conveniently by using polymer, polymer blend or plasticizer as stationary phase and the volatile compound as mobile phase on gas-liquid chromatographic columns.
