Comparison between Successive Precipitation and Column Elution Methods in Compositional Fractionation of Copolymers

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Abstract
In order to compare the efficiencies of successive precipitation and column elution methods in compositional fractionation, mixtures of two styrene-acrylonitrile random copolymers with different chemical compositions were fractionated by the two methods by using the methyl ethyl ketone-cyclohexane system. The compositional distribution curve determined by each method was compared with the curve calculated from a theory on compositional fractionation. The value of a parameter K, which shows the efficiency of compositional fractionation, was determined to have the best agreement between the experimental and calculated curves. It was found that the column elution method is more effective than the successive precipitation method.

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