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<dc:title xml:lang="en">Development and rheological analysis of a surface polymer nanocomposite anti-friction</dc:title>
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<dc:subject xml:lang="fr">Nanoparticules de carbone</dc:subject>
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<dc:subject xml:lang="fr">Coefficient de frottement</dc:subject>
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<dc:subject xml:lang="fr">Tribologie</dc:subject>
<dc:subject xml:lang="en">Polymer</dc:subject>
<dc:subject xml:lang="en">Carbon nanoparticles</dc:subject>
<dc:subject xml:lang="en">Nanocomposite coating</dc:subject>
<dc:subject xml:lang="en">Coefficient of friction</dc:subject>
<dc:subject xml:lang="en">Mechanical contact</dc:subject>
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<dcterms:abstract xml:lang="fr">L'objectif de cette thèse est l'identification de couplages (nanoparticules / matrice de poly(methyl-methacrylate) PMMA) qui renforcent la rigidité de surface du PMMA tout en conservant le maximum de transparence. Le choix s'est porté sur trois type de nanoparticules carbonées : du graphène multicouches (FLG), de l'oxyde de graphène (GO) et des nanotubes de carbones (MWCNT). Une première décrit la préparation et la fonctionnalisation de ces trois types de nanoparticules pour assurer une meilleure dispersion dans la matrice. Deux méthodes ont été retenues pour réaliser ces matériaux composites : la polymérisation en masse et le mélange en solution. Une seconde partie présente la caractérisation des propriétés mécaniques de ces revêtements en trois étapes : en volume, en surface et sous forme de revêtement en couches minces (15-20µm). Les résultats majeurs montrent que les nano-composites réalisés retardent l'apparition de la plasticité comparé à un PMMA pur, même à faible pourcentage, et permettent ainsi de limiter les effets de rayures de surfaces. Le faible pourcentage de renfort permet de conserver la transparence et plus l'épaisseur diminue plus on peut augmenter ce taux de renfort sans dégrader les propriétés mécaniques du revêtement. Les nanoparticules choisies comme agents de renfort de la matrice polymère s'avèrent être également de très bons candidats pour la diminution du frottement comparée à un plastifiant type Erucamide</dcterms:abstract>
<dcterms:abstract xml:lang="en">The goal of this thesis is the identification of couplings (nanoparticles / matrix poly (methyl methacrylate) PMMA) which ensure PMMA surface rigidity while maintaining maximum transparency. The choice fell on three types of carbonaceous nanoparticles: Few layer graphene (FLG), graphene oxide (GO) and carbon nanotubes (MWCNT). A first part describes the preparation and functionalization of these three types of nanoparticles to provide a better dispersion in the matrix. Two methods were used to prepare nanocomposite materials: bulk polymerization and solution blending. A second part presents the characterization of the mechanical properties of these coatings in three stages: volume, surface and thin layer coating (15-20μm). The main results show that nanocomposites made delay the onset of plasticity compared with pure PMMA, even at a low percentage, and help to limit the effects of surface scratches. The small percentage of reinforcement keeps the transparency and the more the thickness decreases the more the rate of reinforcement can increase without degrading the mechanical properties of the coating. Moreover, nanoparticles chosen as the polymer matrix of reinforcing agents prove to be very good candidates for reduction in friction compared to a plasticizer such Erucamide.</dcterms:abstract>
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