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Theses

Renforcement des pneumatiques par la silice. Caracterisation physio-chimique et dispersion des granules de silice.

Abstract : Silica is constantly gaining importance as a reinforcing filler for rubber compounds. It offers several advantages compared to carbon black. In tyres treads, silica can yield a lower rolling resistance at equal wear resistance and wet grip than carbon black. This work consists in the determination of the effects of processes and treatments of precipitated silica granules on their capacity to nicely disperse the silica in the elastomer, without impairing their breakage resistance during dry steps of the process.In this work, physico-chemical characterizations like laser granulometry, specific surface area, SEM, X-ray tomography have been given morphological and structural information on the granule properties. In a second step, the behaviour of silica granules under mechanical stress in various media (air, liquid) by ultrasound solicitation, fluidized bed, impact breakage, is investigated. Mechanisms are observed for the fragmentation of the granules (erosion, attrition, breakage, splitting) and a quantification of the breakage kinetics of granule is proposed. In the last step, a model of the fragmentation process in water is presented. All these experiments give us information about the impact of the process on the granule structures and mechanicals properties.
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Submitted on : Tuesday, October 9, 2012 - 3:23:19 PM
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  • HAL Id : tel-00740183, version 1

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Timothée Dumas. Renforcement des pneumatiques par la silice. Caracterisation physio-chimique et dispersion des granules de silice.. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. Français. ⟨NNT : 2012EMSE0638⟩. ⟨tel-00740183⟩

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