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Adsorption Properties of Chromatographic Sorbents Composed of Thermally Treated Porous Glass and Chemically Bonded Carbowax 20 M

The characteristic feature of controlled porosity glasses (CPG) is the presence of boron atoms on their surface. The concentration of these atoms can be easily changed by a certain thermal treatment [I ]. In consequence adsorption properties of porous glasses depend on their previous heating. The presented work deals with the adsorption properties of the GPGs with chemically bonded Carbowax 20 M on their surface. The procedure of Carbowax bonding to silicous supports is well-known [2], however in this case the distribution of Carbowax thin layer strongly depends on the presence of boron atoms. The investigated materials were obtained by chemical bonding of Carbowax 20 M to the glasses possessing different amounts of the surface boron atoms. On the base of obtained results (adsorption isotherms of various compounds, physico-chemical data) the models of Carbowax bonding are proposed. These models are in agreement with previous hypothesis by AUE [3].