Abstract
AbstractSpecific retention volumes Vg for acetone, 1‐propanol, ethyl acetate, hexane, and tetrahydrofuran were obtained by inverse gas chromatography using poly(ethylene oxide) as stationary phase. Measurements were done at different flow rates, different injected sample amounts, and with three columns of different packing. Retention volumes were measured above and below the melting temperature of the polymer. The shape of the flow diagram and the variation of retention time tr with the sample amount depend on the temperature, flow rate, and the nature of the probe. Moreover, and due to the polymer polarity, the retention volume is a linear function of the column coating. All these factors must be controlled in order to obtain an accurate value of Vg which allows the determination of the crystallinity of the stationary phase. Above Tm, Vg is independent of flow, packing, and amount of the injected sample.
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