Random copolymers of styrene with acrylics can be separated according to their chemical composition by gradient column adsorption chromatography on silica. The composition of the mobile phase that can displace a given copolymer from the silica surface is independent of the shape of the solvent strength gradient and also above the sample molecular weight of ca. M = 100,000.
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Danielewicz et al. (1981) studied this question.
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