Abstract
The combination of size exclusion chromatography (SEC) and high performance precipitation liquid chromatography (HPPLC) of the SEC fractions is performed on a mixture of five styrene-acrylonitrile copolymers (SAN) of strongly different composition and on a commercial SAN sample. HPPLC has proved to give a good separation by chemical composition. The cross-fractionation method has proved to be able to detect the combined molar mass- and chemical composition distribution very accurately. Conditions for an accurate and reliable application of this method are described. Results for the average composition of a commercial SAN as a function of molar mass are compared with those from SEC with dual detection and SEC with pyrolysis gas chromatography.
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