2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

New And Versatile Method To Prepare P(DMAEMA)/Silica Nanoparticles Via Controlled Radical Polymerization in Water

J. Vinas, D. Gigmes, G. Carrot, F. Boué and D. Bertin
Université de Provence, FR

Keywords:
hydrid particles, controlled radical polymerization, aqueous media, synthesis, characterization

Abstract:
Here we report a new and versatile method to prepare hybrid polymer/silica particles in water. P(DMAEMA) has been chosen because of its LCST, allowing synthesis of thermo-sensitive hybrid particles. These objects are prepared in a three steps process. First, silica nanoparticles are synthesized in water, in order to obtain 2nm radius nanoparticles. Second, these particles are grafted by condensation of Atom Transfer Radical Polymerization or Nitroxide Mediated Polymerization initiator on the particles surface. Polymerization was performed at low temperature. At each stage of the process the silica particles were characterized by NMR, TGA and SANS. According to the NMR and TGA characterization, grafting of the two initiators is quantitative. According to the SANS measurements, grafting of the ATRP initiator without no change in the colloidal stability whereas grafting of the NMP initiator leads to increase of the particles size. Using contrast matching, SANS analyses clearly show that the polymer-grafted-silica particles obtained by ATRP exhibit a polymer shell.

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