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

Bailly, Bérangère; Donnenwirth, Anne-Carole; Bartholome, Christèle; Beyou, Emmanuel; Bourgeat-Lami, Elodie

doi:https://doi.org/10.1155/JNM/2006/76371

Journal of Nanomaterials

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Volume 2006 | Article ID 076371 | https://doi.org/10.1155/JNM/2006/76371

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

Bérangère Bailly,^1,2Anne-Carole Donnenwirth,^1,2Christèle Bartholome,^1,2Emmanuel Beyou,¹and Elodie Bourgeat-Lami²

Received02 Feb 2006

Revised09 Nov 2006

Accepted21 Nov 2006

Published16 Jan 2007

Abstract

Polystyrene (PS) chains with molecular weights comprised between 8000 and 64000 g⋅mol-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.

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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.

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