Table of Contents Author Guidelines Submit a Manuscript
Journal of Nanomaterials
Volume 2006 (2006), Article ID 76371, 10 pages

Silica-Polystyrene Nanocomposite Particles Synthesized by Nitroxide-Mediated Polymerization and Their Encapsulation through Miniemulsion Polymerization

1Ingénierie des Matériaux Polymères (IMP), Laboratoire des Matériaux Polymères et des Biomatériaux (LMPB), Université de Lyon 1, Université de Lyon, Villeurbanne Cedex 69003, France
2Laboratoire de Chimie et Procédés de Polymérisation (LCPP), École Supérieure Chimie Physique Electronique de Lyon (CPE), Université de Lyon 1, Université de Lyon, Bâtiment F308, BP 2077, 43 Boulevard du 11 Novembre 1918, Villeurbanne Cedex 69616, France

Received 2 February 2006; Revised 9 November 2006; Accepted 21 November 2006

Copyright © 2006 Bérangère Bailly et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Polystyrene (PS) chains with molecular weights comprised between 8000 and 64000 gmol-1 and narrow polydispersities were grown from the surface of silica nanoparticles (Aerosil A200 fumed silica and Stöber silica, resp.) through nitroxide-mediated polymerization (NMP). Alkoxyamine initiators based on N-tert-butyl-1-diethylphosphono-2,2-dimethylpropyl nitroxide (DEPN) and carrying a terminal functional group have been synthesized in situ and grafted to the silica surface. The resulting grafted alkoxyamines have been employed to initiate the growth of polystyrene chains from the inorganic surface. The maximum grafting density of the surface-tethered PS chains was estimated and seemed to be limited by initiator confinement at the interface. Then, the PS-grafted Stöber silica nanoparticles were entrapped inside latex particles via miniemulsion polymerization. Transmission electron microscopy indicated the successful formation of silica-polystyrene core-shell particles.