Abstract
The separation of styrene oligomers on silica gel was compared using 1,4-dioxane- n-heptane and tetrahydrofuran- n-heptane mobile phases. A simple equation can be used to describe the dependence of the capacity factors for oligomers in normal-phase chromatography both on the degree of polymerization and on the mobile phase composition. It can also be used as the basis of calculations of retention volumes under isocratic conditions and in gradient-elution chromatography. The application of a convex gradient of dioxane in n-heptane enables at least the partial separation of individual oligostyrenes having up to 25–30 oligomer units and the concentration ratios of the individual oligomers in polystyrene samples can be estimated.
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