POLYMER IMMOBILIZATION TO ALKYLCHLOROSILANE ORGANIC MONOLAYER FILMS USING SEQUENTIAL DERIVATIZATION REACTIONS

Covalent immobilization of hydrophobic and hydrophilic polymers in seq uential reactions to surfaces of olefin-terminated alkylsilane monolay ers results in fabrication of polymer-modified ultrathin films. Film s urface chemistry and interfacial energy are modified significantly usi ng this approach, resulting from sandwich-type layers bearing pendant poly(ethylene glycol) or perfluoroalkyl chains exposed on the film sur face. Photoaddition chemistry has been used to react a thiol-bearing p olysiloxane to olefin-terminated alkylsilane monolayers. Additionally, hydrosilylation reactions have also been used to covalently attach Si -H polysiloxanes to olefin-terminated alkylsilane monolayers. XPS and static SIMS have been used to confirm chemistry and yields after these sequential immobilization reactions. Both surface analysis methods pr ovide evidence for the surface chemistry of each immobilization step a t the surface.