Abstract
The properties of poly(ethylene glycol) 20M (PEG 20M) on the silanized surface of Chromosorb W HMDS were investigated. It was found that the surface layer of PEG 20M is in a liquid form below its melting temperature. It the stationary phase loading ratio is above 0.105 the main retention mechanism is partition in both the liquid and solid forms of PEG 20M. The contribution of adsorption to the retention volume was also determined. It is suggested that in the case of methanol this contribution is caused by adsorption on the residual silanol groups present on the support surface whereas for n-octane this is rather adsorption on the gas-liquid interface.
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