Abstract
The evolution of the surface properties of two types of fumed silica impregnated with different amounts of different polymers (polyethyleneglycol (PEG), polyvinylchloride (PVC), polyvinylmethylketon (PVMK) or polystyren (PS)) has been studied by inverse gas chromatography at infinite dilution. IGC-ID is a convenient method for the examination of the surface properties of a solid in which molecular probes are injected in very small amounts so that they mainly interact with sites of highest energy. The impregnation of silica with increasing polymer ratios leads to the progressive killing of these sites, allowing the probes to access the less energetic free sites. The polymers were chosen on the basis of their acidic or basic properties. A basic polymer, like PEG or PS, should first interact with the silanol groups, whereas an acidic polymer should interact preferentially with siloxane bridges. What behaviour will be adopted by an amphoteric polymer, such as PVMK?
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