Abstract
The retention mechanism has been studied for n-alkane analytes within a cross-linked commercial poly(dimethylsiloxane) stationary phase and laboratory-synthesized poly(methyl-n-alkylsiloxane) substrates with different alkyl chain lengths. Model capillary columns were prepared with these phases and the specific retention volumes of the analytes measured within the range of 80-160/sup 0/C. The following thermodynamic calculations indicate that bulk dissolution appears to be the dominant mechanism for retention of alkanes within these stationary phases.
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