The free-radical cotelomerization of 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) with perfluorodecylacrylate (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 (IME) 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 analyses. The grafting yield increased with the copolymer/silica weight ratio until a maximum value of 2.26 μmol.m -2 .
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