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Polymérisation radicalaire contrôlée en émulsion et dispersion. Synthèse de nanoparticules thermo- et/ou pH sensibles

Guillaume Delaittre 1
1 LCP - Chimie des polymères
UPMC - Université Pierre et Marie Curie - Paris 6, IPCM - Institut Parisien de Chimie Moléculaire, CNRS - Centre National de la Recherche Scientifique : UMR7610
Abstract : A water-soluble macroalkoxyamine (SG1 nitroxide-capped poly(acrylic acid)) was successfully used in controlled radical polymerization in aqueous dispersed media. In emulsion, poly(n-butyl acrylate), polystyrene or corresponding copolymer latexes were obtained for the first time in a batch ab initio process. The recipe does not need any classical surfactant. Diblock copolymer particles consisting of a hydrophobic core and a polyelectrolyte shell are synthesized within concentrated suspensions reaching 40 wt.% solids. Molar masses and polydispersity indexes reveal a controlled polymerization mechanism in spite of a low initiator efficiency. Different parameters were proven to influence molar masses and particle diameter. Particle formation is discussed as well as kinetics of polymerization in particles. In dispersion, poly(N,N-diethylacrylamide) particles that can reversibly dissociate under temperature changes were synthesized to 40 wt.% solids with similar macromolecular and colloidal characteristics as that of particles obtained in emulsion. Introducing a crosslinker in a batch or semi-batch process, thermally-sensitive nanogels can be produced. This result is a major advance in this field as concentrated suspensions of small nanogels have been obtained without surfactant for the first time.
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https://tel.archives-ouvertes.fr/tel-00277445
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Submitted on : Tuesday, May 6, 2008 - 2:12:04 PM
Last modification on : Monday, December 14, 2020 - 9:53:12 AM
Long-term archiving on: : Friday, May 28, 2010 - 6:32:44 PM

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  • HAL Id : tel-00277445, version 1

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Guillaume Delaittre. Polymérisation radicalaire contrôlée en émulsion et dispersion. Synthèse de nanoparticules thermo- et/ou pH sensibles. Matériaux. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00277445⟩

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