Abstract
The principal factors in preparing columns for inverse gas chromatography (IGC) were investigated, with particular interest in obtaining a distinct Z-shaped retention diagram which can be seen near at the glass transition or melting temperature of a polymer by using a small amount of the polymer. The use of a silane-treated support of a relatively large surface area was found to be favorable. It was also found effective to use a casting solvent that gives a smooth and glassy polymer film. The Z-shaped retention curve became more distinct as the column was loaded with more polymer. The solute retention mechanism at an extremely low polymer loading may differ from that at an ordinary polymer loading. Plots of logVN vs. 1/T (VN, net retention volume, T, column temperature) for the columns prepared at various polymer loadings were examined to find the best polymer loading. The retention diagram of the initial heating-up measurement was different from that of the subsequent measurement, and this may be attributed to thermal hysteresis.
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