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Étude rhéo-optique des mécanismes de dispersion du noir de carbone dans des élastomères

Abstract : We observed and quantified, with a transparent counter-rotating rheometer, dispersion mechanisms (erosion and rupture) of a carbon black cluster embedded in an elastomer matrix submitted to simple shear. Dispersion laws were determined: rupture is characterised by a critical shear stress that is inversely proportional to the cluster size, erosion is defined by a kinetics law relating the eroded volume to the applied shear stress and quantity of strain units, but independent of the cluster size. The effect of key parameters for dispersion (infiltration, concentration) was studied. Erosion is accelerated by a thin infiltration of the cluster by the matrix or by the filler concentration (via the frequency of collision). A mixing model was built. It predicts the evolution of the carbon black cluster radius versus the mixing time. This tool can be used to optimise the dispersion step in a real industrial mixer.
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  • HAL Id : tel-00443609, version 1

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Véronique Collin. Étude rhéo-optique des mécanismes de dispersion du noir de carbone dans des élastomères. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2004. Français. ⟨NNT : 2004ENMP1168⟩. ⟨tel-00443609⟩

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