Effects of Porosity and Surface Area of Octadecyl-Derivatized Silica on Fractionations of Oligomers of 800 MW Polystyrene

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Abstract
Increasing the pore size of silica used to produce a C18-derivatized column packing decreased the exclusion of the larger oligomers of an 800 MW sample of monodisperse polystyrene. More important was the decrease in surface area which degraded the fractionation of oligomers, which was based upon adsorption. Larger sample volumes and higher concentrations also degraded that fractionation, as expected.