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Dispersion des nanotubes de carbone à l'aide de copolymeres triblocs dans des matrices en polyamide : Relation morphologie-proprietes electriques

Abstract : Carbon nanotubes are an optimal load because of their high aspect ratio to enable conductivity with a low percolation level in polymer matrix. We were concerned to optimize the CNTs dispersion in polyamide-6 matrix by optical observations, the shear mixing being important parameters. The growth of PA-6 trans-crystalline lamellae from the surface of the CNTs is observed. The conductivity study shows its increase with a post thermal treatment because of the CNTs aggregation. The conductivity increases when the treatment temperature increase or when the mass of the matrix decrease. Masterbatch of SBM/CNTs were prepared by melting and solution method and diluted in PA-6. The state of dispersion and the conductivity were improved with the triblock copolymers SBM because of the specific localisation of the CNTs in the composite. They are located in the SBM particles for the melting procedure and in the PA-6 for the solution procedure. The specific localisation of the CNTs in the composite is important to improve the percolation level.
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Submitted on : Tuesday, November 10, 2009 - 11:01:52 AM
Last modification on : Wednesday, October 14, 2020 - 3:43:24 AM
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  • HAL Id : tel-00430869, version 1

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Anne-Carine Brosse. Dispersion des nanotubes de carbone à l'aide de copolymeres triblocs dans des matrices en polyamide : Relation morphologie-proprietes electriques. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00430869⟩

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