Elution behavior of styrene oligomer fractions in supercritical fluid chromatography |
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Authors: | Dietger Leyendecker Dagmar Leyendecker Franz P Schmitz Ernst Klesper |
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Institution: | (1) Lehrstuhl für Makromolekulare Chemie der RWTH Aachen, Worringerweg, D-5100 Aachen, FRG |
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Abstract: | Summary In supercritical fluid chromatography (SFC), the elution behavior of styrene oligomers in pentane depends greatly on the degree of oligomerization, n. The influence of capacity ratio, k , on the lower oligomers up to about n=11 resembles the behavior of other substrates of low molecular weight, like aromatic hydrocarbons. Thus, with pentane of 100 bar and below, minima are found in plots of k versus temperature. In contrast, the k of oligomers of higher molecular weight (n>11) increase monotonously with increasing temperature. The studies were performed using oligostyrene fractions obtained by semipreparative SFC fractionation. |
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Keywords: | Supercritical fluid chromatography Styrene oligomers Semipreparative fractionation Capacity ratios vs temperature |
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