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Designing Organic/Inorganic Colloids by Heterophase Polymerization
Author(s) -
BourgeatLami Elodie,
Herrera Norma Negrete,
Putaux JeanLuc,
Perro Adeline,
Reculusa Stéphane,
Ravaine Serge,
Duguet Etienne
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750223
Subject(s) - macromonomer , materials science , polymerization , emulsion polymerization , chemical engineering , polymer , nanocomposite , methyl methacrylate , polymer chemistry , particle (ecology) , colloid , nanoparticle , particle size , composite material , nanotechnology , oceanography , engineering , geology
Polymer/silica and polymer/Laponite nanocomposite colloids with various morphologies have been elaborated through emulsion polymerization using a polymerizable organosilane (route I) and a methyl methacrylate‐terminated macromonomer (route II) as coupling agents. Depending on the synthetic strategy and on the nature of the mineral particles, either core‐shell, raspberry‐like, multipod‐like, currant bun or inverted core‐shell morphologies (the mineral forming the shell) were achieved. Beyond the control of particle shape, we have demonstrated that some of the polymerizations exhibited particular kinetics behaviors which could be correlated to the mechanism of formation of the composite particles. Interestingly, conversion versus time curves of a series of soap free polymerizations performed in the presence of the macromonomer showed a significant increase in the polymerization rate with increasing the inorganic particles concentration. Characterization of the composite latexes by transmission electron microscopy showed that the mineral was located at the surface of the latex spheres and participated therefore to their stabilization. The higher the amount of inorganic particles, the lower the particles size and the higher the polymerization rate.