Volume 36, Number 2, October II 1996
|Page(s)||153 - 158|
|Section||Cross-disciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Nanosized hairy grains: A model system to understand the reinforcement
Laboratoire Léon-Brillouin, CNRS-CEA, Centre d'Etudes Nucléaires de Saclay,
91191 Gif-Sur-Yvette Cedex, France
2 FAST, URA 871 du CNRS, Université Paris-Sud - 91405 Orsay Cedex, France
3 Institut Curie, UMR 168 du CNRS, Section de Recherche, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
4 Rhône-Poulenc, Usine Silicones - BP22, 69191 Saint-Fons Cedex, France
Accepted: 30 August 1996
We have prepared nanosized hairy grains by grafting long polydimethylsiloxane chains onto silica particles of radius . The synthesis method allows the particles to keep in truly stable suspension at any stage of their preparation. In dilute suspension, these hairy grains behave as repulsive soft spheres. Above a certain concentration (of the order of ), the polymer chains form bridges between the particles due to physical adsorption, which induces a gelation of the suspension. If the solvent is completely removed, a reinforced elastomer is formed. Its mechanical properties (which can be exceptionally good) are entirely determined by the design of the ultimate particles.
PACS: 81.05.Qk – Reinforced polymers and polymer-based composites / 82.70.Dd – Colloids / 61.41.+e – Polymers, elastomers, and plastics
© EDP Sciences, 1996
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