Abstract
Studies of the gas chromatographic behaviour of bonded and coated PEG 20M stationary phases showed that bonded PEG 20M has a liquid-type structure above room temperature. Retention diagrams for several solute molecules in the form of ln V r versus the reciprocal of the absolute temperature show clear differences between bonded and coated PEG 20M on Chromosorb W. The absence of an inflection in the retention diagrams for bonded PEG 20M is observed, in contrast to the marked change in retention volumes for coated PEG 20M at or near the melting points. Both bonded and coated PEG 20M have almost identical enthalpies above the melting point of coated PEG 20M and the same holds for bonded PEG 20M at .80 °C and 35 °C. Peak asymmetry was calculated and marked differences between bonded and coated PEG 20M stationary phases were observed.
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