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            <title xml:lang="en">Aggregate formation of surface-modofoed nanoparticles in solvent and polymer nanocomposites</title>
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                <forename type="first">Dafne</forename>
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                <forename type="first">Anne-Caroline</forename>
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            <idno type="halRefHtml">&lt;i&gt;International Conference on Self-Assembly of Colloidal Systems (SACS 18)&lt;/i&gt;, Sep 2018, Bordeaux, France</idno>
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            <idno type="stamp" n="UNIV-MONTPELLIER">Université de Montpellier</idno>
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              <p>Polymer nanocomposites (PNCs) are made by dispersion of hard fillers in a polymer matrix, where the fillers are usually added to enhance mechanical properties. Thus, such materials attract industrial interest and their investigation is essential for the improvement of their performances.The present study concerns nanocomposites obtained using hydrophilic silica nanoparticles (NPs) dispersed in a soft polymer matrix of styrene-butadiene, commonly used in car tire manufacturing. The mechanical performances of such PNCs are strongly related to the structural properties: the dispersion state of silica particles in the polymer melt is governed by the mixing protocols (e.g., solid phase mixing or solvent casting) and thermodynamics of the system (i.e., particle miscibility) which influence the filler-filler and the filler-polymer interactions.We developed a new model nanocomposite system, equivalent to a simplified industrial one, made by solvent casting technique using colloidal silica NPs. In such model PNCs, the dispersion of colloidal silica is tuned via the surface-modification of silica particles by grafting hydrophobic molecules, i.e., silane coating agents, which promote the filler-polymer compatibility.To describe NP structure in solvents and after casting into polymer matrix, we propose a new method which combines Small Angle X-ray Scattering (SAXS), reverse Monte Carlo (RMC) and aggregate recognition (AR) analysis. This approach allows obtaining a detailed structural characterization of the silica NPs surface-modified with different silane grafting groups (i.e., tri-ethoxy, tri-methoxy or mono-methoxy silane). In particular, we show that silane molecules with trifunctional grafting functions may lead to the formation of polycondensed patches (i.e., reaction of lateral groups with neighboring molecules) on silica surface, favoring attractive interactions. Thus, the lowest aggregation is observed using mono-functionalized silane molecules where patches cannot form.Next, the SAXS-RMC-AR approach will be extended to investigate the structural properties of nanocomposite systems where silica NPs are surface-modified with silane molecules of various alkyl chain.</p>
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