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<dc:title xml:lang="en">Relationships between the phase behavior and mechanical properties of synthetic polyelectrolyte complex coacervates</dc:title>
<dcterms:alternative xml:lang="fr">Relations entre le comportement de phase et les propriétés mécaniques des coacervats complexes de polyélectrolytes synthétiques</dcterms:alternative>
<dc:subject xml:lang="fr">Coacervation complexe</dc:subject>
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<dc:subject xml:lang="fr">Superposition</dc:subject>
<dc:subject xml:lang="fr">Comportement de phase</dc:subject>
<dc:subject xml:lang="fr">Adhésion</dc:subject>
<dc:subject xml:lang="en">Complex coacervation</dc:subject>
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<dc:subject xml:lang="en">Superposition</dc:subject>
<dc:subject xml:lang="en">Phase behavior</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse examine la relation entre le comportement de phase et les propriétés mécaniques des coacervats complexes (CC) dans différents systèmes de polyélectrolytes (PE) synthétiques. Pour les PE linéaires forts, une région à forte concentration en PE a été explorée, révélant la transition de systèmes biphasés vers monophasés. L’analyse rhéologique par superposition temps-PE a mis en évidence des liens entre comportement de phase et la viscoélasticité des CC. Bien que le sel tende à dissocier les paires de macroions vers un système monophasé, la région à forte salinité d’un copolymère a aussi été étudiée. Pour les PE faiblement chargés, l’augmentation de la salinité provoque une transition d’une séparation associative à ségrégative, déshydratant la phase riche en polymères. Les PE faibles ont enfin servi à ajuster les propriétés mécaniques des CC déshydratés. Ce travail identifie les paramètres clés et approfondit la compréhension de la coacervation pour des matériaux durables.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis explores how phase behavior relates to the mechanical properties of complex coacervates (CC) across various synthetic polyelectrolyte (PE) systems. For strong linear PE, a high-PE-concentration region of the phase diagram was mapped, revealing transitions from two-phase to one-phase systems. Rheological analysis via time-PE superposition showed clear links between phase behavior and viscoelasticity. While salt typically dissociates macroion pairs to dissolve CC, the high-salt region of a copolymer-based system was also investigated. For weakly charged PE, increasing the salt concentration was found to drive associative toward segregative phase separation, dehydrating the polymer-rich phase and expelling hydrophilic PE. Weak PE were further used to adjust the mechanical properties of dehydrated CC. This work identifies key parameters governing CC properties and advances the understanding of developing sustainable CC-based materials.</dcterms:abstract>
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