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<dc:title xml:lang="en">Large deformation shear and elongation rheology of polymers for electrospinning and other Industrial Processes</dc:title>
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<dc:subject xml:lang="fr">LAOS</dc:subject>
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<dc:subject xml:lang="fr">Electrospinning</dc:subject>
<dc:subject xml:lang="fr">Nanofibres</dc:subject>
<dc:subject xml:lang="fr">Cisaillement</dc:subject>
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<dc:subject xml:lang="en">Electrospinning</dc:subject>
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<dc:subject xml:lang="en">Extensional rheology</dc:subject>
<dc:subject xml:lang="en">Oscillatory shear rheology</dc:subject>
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<tef:elementdEntree autoriteExterne="033882118" autoriteSource="Sudoc">Matériaux nanostructurés</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les objectifs de cette thèse concernent la caractérisation des polymères à l’état fondu via la rhéologie non linéaire dans les modes de cisaillement ou en élongationnel et les procédés faisant intervenir de fortes élongations tel que l’électrospinning en voie solvant et en voie fondue. Pour atteindre le premier objectif, nous nous sommes concentrés sur la caractérisation des polymères fondus enchevêtrés dans les régimes viscoélastiques linéaires et non linéaires. L'influence de la masse moléculaire, Mw et de sa distribution MWD, la présence de longues chaînes branchées (LCB) ou encore l'addition de nanoparticules dans la matrice de polymère à l'état fondu ont été étudiées en utilisant des techniques rhéologiques en cisaillement et en élongationnel. Dans le cas des écoulements de cisaillement oscillatoires à grandes amplitudes (LAOS), nous avons proposé de nouveaux paramètres mécaniques qui ont permis de définir les relations structure-propriétés des différents systèmes étudiés.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The goals of this thesis are the characterization of polymer melts using mainly non-linear shear and extensional rheological techniques. The fabrication of scaffolds with excellent physical and mechanical properties using solution electrospinning technology for tissue engineering applications and the development of melt electrospinning equipment to facilitate the fabrication of solvent free scaffolds. To achieve the first goal, we focused on the characterization of entangled polymer melts in the linear and nonlinear viscoelastic regimes. The influence of molecular weight, Mw, molecular weight distribution (MWD), long-chain branching (LCB) and addition of particles to the polymer matrix on polymer melt properties were investigated using shear and extensional rheological techniques. The resulting structure-property relationships were established using newly introduced mechanical parameters under large amplitude oscillatory shear (LAOS) flow.</dcterms:abstract>
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