Abstract
Polyvinylpyrrolidone (PVP) adsorption onto silica is shown to be strongly dependent on surface chemistry whereas polyethylene oxide adsorption exhibits less dependence on surface chemistry. The surface of silica was modified with four different chemical treatments: surface grafting of polymer, silylation with vinyltriethoxysilane, silylation with ethyltriethoxysilane, and silylation with isobutyltrimethoxysilane. Isotherms for PVP adsorption were measured on the untreated surface and the four treated surfaces. Both large increases and large decreases in the amount adsorbed relative to the untreated surface were recorded. Adsorption of polyethylene oxide was conducted in the plateau region on untreated silica and on polymer-grafted silica.
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