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Preparation and Characterization of Pure and Mixed Monolayers of Poly(ethylene Glycol) Brushes Chemically Adsorbed to Silica Surfaces

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journal contribution
posted on 10.04.2007, 00:00 by Cathy E. McNamee, Shinpei Yamamoto, Ko Higashitani
We prepared pure and mixed monolayers of methoxy-terminated poly(ethylene glycol)s (m-PEG's) chemically attached to silica surfaces by using m-PEG silane coupling agents of three different molecular weights. These films were subsequently characterized in water by atomic force microscopy (AFM). Images of pure m-PEG monolayers showed the formation of polymer brushes on silica. Force curves between two modified surfaces suggested that an increase in the number of oxyethylene (OE) groups from 6 (PEG6 surface) to 43 (PEG43 surface) to 113 (PEG113 surface) decreased the flexibility of the m-PEG chains in the m-PEG brushes. Frictional force measurements also showed that the friction increased in the order PEG6 < PEG43

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