Abstract
A method is discussed for the preparation of charge-stabilized polystyrene latex particles carrying terminally grafted short poly(ethylene oxide) (PEO) chains. The latices have relatively large particles (size, 480 nm), a surface charge, and possess on the surface a methoxy PEO/methacrylate molecule (containing 8 segments of EO). The surface properties of this latex are compared with those of a similar latex but without the PEO surface group. The presence of the PEO moiety on the particle surface could be established by determination of the colloidal stability against salt, complexation with molybdatophosphoric acid, protein adsorption and proton NMR. From the molybdatophosphoric acid and proton NMR results it follows that the average surface coverage of PEO chain is roughly 1 molecule per square nanometre.
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