Polymer Immobilization to Alkylchlorosilane Organic Monolayer Films Using Sequential Derivatization Reactions

Abstract

Covalent immobilization of hydrophobic and hydrophilic polymers in sequential reactions to surfaces of olefin-terminated alkylsilane monolayers results in fabrication of polymer-modified ultrathin films. Film surface chemistry and interfacial energy are modified significantly using this approach, resulting from sandwich-type layers bearing pendant poly(ethylene glycol) or perfluoroalkyl chains exposed on the film surface. Photoaddition chemistry has been used to react a thiol-bearing polysiloxane 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 provide evidence for the surface chemistry of each immobilization step at the surface.