Preparation and characterization of pure and mixed monolayers of poly(ethylene glycol) brushes chemically adsorbed to silica surfaces |
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Authors: | McNamee Cathy E Yamamoto Shinpei Higashitani Ko |
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Affiliation: | Department of Chemical Engineering, Kyoto University-Katsura, Nishikyo-ku, Kyoto, Kyoto 615-8510, Japan. cathymcn@z06cheme.mbox.media.kyoto-u.ac.jp |
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Abstract: | 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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