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Influence de la dispersion des charges et de la conformation des chaines sur les propriétés mécaniques de systèmes nanocomposites SBR/Silice

Abstract : In tire industry, the incorporation of nano-sized silica in rubber leads to elastomeric materials with enhanced mechanical properties. In a fundamental approach, two main contributions are commonly accepted to explain these changes: (i) a first from the filler network highly depending on their dispersion, (ii) a second from the chains whose the conformation is potentially modified by the filler network. However, the mechanisms which permit to correlate these nanometric structural properties to the macroscopic mechanical properties are still poorly understood. In such a context, we have synthesized model nanocomposites SBR/silica systems constituting a first approach of more complex industrial systems. By varying dispersions conditions by using grafting agents, we have obtained various and reproducible dispersions, with multi-scale organizations. They have been finely characterized by combining Small Angle X-Ray Scattering (SAXS) and Transmission Electron Microscopy (TEM). Chain conformation experimentally determined by Small Angle Neutron Scattering (SANS) is not affected by any long range effect of fillers. The quantitative characterization of filler dispersions has shown the major role of silica aggregates compactness and the density of their network on the reinforcement in the elastic regime.
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Adrien Bouty. Influence de la dispersion des charges et de la conformation des chaines sur les propriétés mécaniques de systèmes nanocomposites SBR/Silice. Autre. Université Paris Sud - Paris XI, 2013. Français. ⟨NNT : 2013PA112299⟩. ⟨tel-00925836⟩

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