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Structure et propriétés de matériaux composites obtenus par hétérocoagulation de latex de caoutchouc naturel et de noir de carbone

Abstract : This thesis investigates the storage hardening of natural rubber and carbon black composites made by heterocoagulation. Heterocoagulation is a process that consists in injecting a carbon black slurry at high speed into a colloidal suspension of natural rubber. We obtain a squishy and highly hydrated material that is subsequently dried and processed using an internal mixer or a mechanical press. The hardening is characterized using various rheological techniques among which torsional rheology and Mooney viscosimetry. Many parameters are investigated: the processing technique, the storage environment, the presence of residual water, temperature, the carbon black content. We define characteristic times of hardening whose temperature dependence indicates that the hardening results from a activated process. The energies of activation are nearly independent of the experimental parameters and compare well to that found in natural rubber. Swelling experiments in good solvent show that hardening is associated with the buildup of an interconnected network of macromolecules. We discuss the origin of this network in relation with the microstructure of natural polyisoprene and the presence of phospholipids and proteins.
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Submitted on : Tuesday, January 4, 2022 - 2:23:09 PM
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Quentin Nozet. Structure et propriétés de matériaux composites obtenus par hétérocoagulation de latex de caoutchouc naturel et de noir de carbone. Matière Molle [cond-mat.soft]. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLS033⟩. ⟨tel-03510204⟩

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