Efficient Synthesis of Snowman- and Dumbbell-like Silica/Polymer Anisotropic Heterodimers through Emulsion Polymerization Using a Surface-Anchored Cationic Initiator
AKO, Komla
Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
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Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
AKO, Komla
Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
SPALLA, Olivier
Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
THILL, Antoine
Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
< Réduire
Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire [LIONS]
Langue
en
Article de revue
Ce document a été publié dans
Macromolecules. 2012, vol. 45, n° 17, p. 7009-7018
American Chemical Society
Résumé en anglais
We report a novel original synthetic route to hybrid dissymmetrical snowman- and dumbbell-like silica/polymer colloidal particles through emulsion polymerization of methyl methacrylate (MMA) or styrene using a bicationic ...Lire la suite >
We report a novel original synthetic route to hybrid dissymmetrical snowman- and dumbbell-like silica/polymer colloidal particles through emulsion polymerization of methyl methacrylate (MMA) or styrene using a bicationic initiator previously anchored on the silica surface. Anisotropic particles with a polymer nodule attached to a single silica sphere were successfully obtained in high yield in the presence of a mixture of nonionic and anionic surfactants under optimized initiator concentration conditions. Both nonionic surfactant and cationic initiator were key ingredients in controlling particle morphology as evidenced by transmission electron microscopy. By optimizing the silica content and the surfactant composition, latexes with a latex-to-silica seed number ratio (NLatex/NSilica) close to 1 were produced using either MMA or styrene as monomers. Their shapes evolved from snowman-like and reverse snowman-like at low and high conversions to dumbbell-like for intermediate conversions. The evolution of particle morphology with time provided insights into the mechanism of composite particles formation.< Réduire
Mots clés en anglais
Emulsion Polymerization
Silica Polymer
Project ANR
Towards Colloidal Molecules and Functional Materials - ANR-07-BLAN-0271
Origine
Importé de halUnités de recherche