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Mécanismes élémentaires de dispersion de charges de silice dans une matrice élastomère

Abstract : This work reports the rheo-optical study of dispersion mechanisms of reinforcing fillers in an elastomer matrix under shear. The purpose of this work was to determine key parameters for dispersion in order to improve the filler dispersion step in a rubber for pneumatic application. This study showed that the dispersibility of a filler such as carbon black or silica is characterized by a critical stress to overcome and a dispersion mechanism. The dispersion study of precipitated silica grades in the shape of micropearls and of carbon black showed that the dispersion criteria for the two filler depend on the internal organization of the granules. Carbon black dispersion is dominated by the fractal organization of its aggregates. Silica micropearls present a skin-core-internal organization. The dispersion criterion for silica is linked to the skin cohesion strength. The dispersion mechanism is related to the stress propagation pathway within the micropearl and thus to the cohesion of the core. The chemical-physical treatment of silica surface during their processing enables to modify the cohesion of silica micropearls and consequently the dispersion mechanism and stress level for dispersion.
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https://pastel.archives-ouvertes.fr/pastel-00617953
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Submitted on : Wednesday, August 31, 2011 - 10:13:04 AM
Last modification on : Wednesday, October 14, 2020 - 4:02:46 AM
Long-term archiving on: : Thursday, December 1, 2011 - 2:21:22 AM

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  • HAL Id : pastel-00617953, version 1

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Innocent Boudimbou. Mécanismes élémentaires de dispersion de charges de silice dans une matrice élastomère. Matériaux. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0018⟩. ⟨pastel-00617953⟩

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