Modification of silica nanoparticles by grafting of copolymers containing organosilane and fluorine moities

Abstract

Abstract The free‐radical cotelomerization of 3‐(trimethoxysilyl)propyl methacrylate (TMSPMA) with 1,1,2,2‐tetrahydroperfluorodecyl acrylate (PFDA) in the presence of 2‐mercaptoethanol was performed at 80 °C in acetonitrile. Hydroxy end‐groups of the cotelomers were reacted with 2‐isocyanatoethyl methacrylate to give macromonomers. The P(TMSPMA‐ stat ‐PFDA) cotelomers, containing fluoro and silane groups, were then grafted onto silica nanoparticles. Optimal grafting conditions were found with TMSPMA monomer alone in toluene at 110 °C. The structure of the modified silica was analyzed by FTIR and 29 Si solid‐state NMR. The amount of grafted TMSPMA or P(TMSPMA‐ stat ‐PFDA) was calculated by thermogravimetric and elemental analyzes. The grafting yield increased with the copolymer/silica weight ratio until a maximum value of 2.26 μmol/m 2 . © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 4617–4628, 2009