Nanocomposites à matrice polyamide 6 ou polystyrène et à renforts de nanotubes de carbone : du procédé de synthèse aux phénomènes de percolation

Abstract : The introduction of carbon nanotubes into polymers leads to nanocomposite materials with exceptional properties. These later depend, however, on the dispersion and distribution of carbon nanotubes inside the matrix. A key objective, in nanocomposite preparation, is the set up of incorporation processes allowing a good state of dispersion of the nanotubes into the matrix. An in situ polymerization process, coupled with an ultrasound processor, was chosen to best fulfill this objective. The optimization of this process implies the knowledge of the evolution of reaction kinetics and rheological properties during the polymerization. The influence of carbon nanotubes on the anionic activated polymerization of e-caprolactam was investigated by calorimetric and rheokinetic studies. Carbon nanotubes were found to slow down polymerization kinetics and highly increase the viscosity after a certain conversion degree. This inhibition phenomenon could be produced by a reaction between carbon nanotubes and the catalyst employed for the polymerization reaction. The inhibition effect depended also on the state of dispersion of the nanotubes, consequently, kinetic and rheokinetic measurements are an indirect method to estimate the state of dispersion. The electrical and rheological properties of the nanocomposites were also investigated. The influence of the state of dispersion and other parameters, such as temperature, on the electrical and rheological percolation thresholds was identified
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Christian Penu. Nanocomposites à matrice polyamide 6 ou polystyrène et à renforts de nanotubes de carbone : du procédé de synthèse aux phénomènes de percolation. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL087N⟩. ⟨tel-01753005⟩

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