la063512l_si_001.pdf (425.52 kB)
Download file

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

Download (425.52 kB)
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