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<dc:title xml:lang="fr">Rhéologie des polymères dans les contacts confinés : tribologie des interfaces étudiées par un nouveau dispositif couplant FRAPP et nanotribologie</dc:title>
<dcterms:alternative xml:lang="en">Rheology of polymers in confined contacts : tribology of interface studied by a new device coupling FRAPP and nano-tribology</dcterms:alternative>
<dc:subject xml:lang="fr">Zone interfaciale</dc:subject>
<dc:subject xml:lang="fr">NanoTribo-FRAPP</dc:subject>
<dc:subject xml:lang="fr">Rhéologie</dc:subject>
<dc:subject xml:lang="fr">Vitesse locale</dc:subject>
<dc:subject xml:lang="fr">Plans de glissement</dc:subject>
<dc:subject xml:lang="en">Interfacial zone</dc:subject>
<dc:subject xml:lang="en">NanoTribo-FRAPP</dc:subject>
<dc:subject xml:lang="en">Rheology</dc:subject>
<dc:subject xml:lang="en">Local velocity</dc:subject>
<dc:subject xml:lang="en">Slip planes</dc:subject>
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<tef:elementdEntree autoriteExterne="029991242" autoriteSource="Sudoc">Polymères -- Rhéologie</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="030027527" autoriteSource="Sudoc">Réseaux polymères</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031401295" autoriteSource="Sudoc">Matériaux organiques</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027867048" autoriteSource="Sudoc">Phospholipides</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ce travail porte sur le développement d’une nouvelle technique expérimentale dédiée à l’étude de la rhéologie mise en jeux lors du glissement d’une pointe rigide sur une surface de polymère. Ce travail s'est déroulé progressivement de l'échelle mésoscopique vers l'échelle nanométrique. Pour cette dernière, la zone ciblée est la zone interfaciale confinée et cisaillée.Pour mettre en évidence les comportements de la zone cohésive, nous avons étudié un système de réseaux interpénétrés de polymères (RIPs) CR39-PMMA. Grâce à leurs propriétés ajustables, nous pourrons utiliser les RIPs sont utilisés comme substrat pour étudier la zone interfaciale en variant facilement les paramètres rhéologiques.Pour étudier les propriétés de la zone interfaciale, des couches phospholipidiques de DSPC ont été choisies comme matériau modèle. Leurs structures ont été étudiées par la réflectivité spéculaire de neutron. Nous montrons que la structure des couches supportées de DSPC est robuste, et le taux d’humidité́ relative joue un rôle important sur la structure. Les essais de glissement sur des couches de DSPC ont permis de relever les influences des paramètres mécaniques et environnementaux sur la contrainte de cisaillement Le développement du NanoTribo-FRAPP permet de caractériser le cisaillement des couches de DSPC sur une lame de verre, tout en mesurant la vitesse d’écoulement locale des couches moléculaires nanométriques. Nous pouvons ainsi estimer les plans de glissement en fonction de la vitesse.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This work deals with the development of a new experimental technique and its application to study the rheology of a highly confined and sheared interfacial zone involved in the sliding of a rigid tip on a polymer suface. This tribological work has been conducted gradually from the mesoscopic scale to the nanoscale.To highlight the behavior of the cohesive zone, we studied an interpenetrating polymer network system (INPs) CR39-PMMA. Thanks to their adjustable properties, we may use the INPs as a substrate to study the interfacial zone by easily varying the rheological parameters.To study the rheological properties in the interfacial zone, the phospholipid layers of DSPC have been chosen as model material. The structures have been studied by the neutron reflectivity experiments. We show that the structure of supported layers of DSPC is robust, and the relative humidity plays a key role on it. Sliding tests on the DSPC layers reveals the influences of mechanical and environmental parameters on the shear stress. The development of NanoTribo-FRAPP allows to characterize the shear conditions of DSPC layers, with the measurements of local velocity of these of nanoscale molecular layers. This gives us access to estimate the slip planes as a function of imposed velocity.</dcterms:abstract>
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