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Coagulation d'un latex de caoutchouc naturel - noir de carbone / silice : suivi de l'évolution nanostructurale d'une suspension colloïdale à un composite d'élastomère

Abstract : Natural rubber (NR) latex extracted from Hevea brasiliensis is known to be used for the preparation of a variety of materials. Addition of reinforcing fillers is a well-establish method to increase mechanical properties of the polymer matrix and it is necessary to achieve the required strength for most applications. Several strategies have been proposed to mix rubber with fillers. Among the different methods, the liquid mixing process seems interesting and it is central for Michelin innovation technology. In this process, NR latex is mixed with an aqueous suspension of fillers (silica/ carbon black) giving rise to a hetero-coagulum, which is further subjected to dehydration and drying. If this process is quickly developing at engineering level, the structural knowledge of the hetero-coagulum along the process as well as the mechanisms regulating aggregation is still at its infancy. To this aim, we employed a multimodal microscopy approach comprising: Field Emission Scanning Electron Microscopy (FESEM) (with both backscattering electron imaging and secondary electron), oprical super resolution microscopy (dSTROM) and atomic force microscopy coupled with infrared spectroscopy (AFM-IR) to investigate on the nanostructure of the hetero-coagulum and its evolution towards an elastomeric composite. We believe that understanding micro/nanoscopic mechanisms occuring during the liquid mixing process might open open up new ways of imrpovent and exploitation of this technology.
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https://tel.archives-ouvertes.fr/tel-03104598
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Submitted on : Saturday, June 12, 2021 - 8:26:09 AM
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  • HAL Id : tel-03104598, version 2

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Gianluca Cattinari. Coagulation d'un latex de caoutchouc naturel - noir de carbone / silice : suivi de l'évolution nanostructurale d'une suspension colloïdale à un composite d'élastomère. Material chemistry. Université Paris-Saclay, 2020. English. ⟨NNT : 2020UPASF009⟩. ⟨tel-03104598v2⟩

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