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<dc:title xml:lang="en">Poly(thioether) micro- and nanoparticles produced by low energy emulsification devices and continuous-flow photopolymerization</dc:title>
<dcterms:alternative xml:lang="fr">Micro- et nanoparticles de poly(thioéther) produites par des dispositifs d’émulsification basse énergie et photopolymérisation continue</dcterms:alternative>
<dc:subject xml:lang="fr">Thioether</dc:subject>
<dc:subject xml:lang="fr">Microfluidique</dc:subject>
<dc:subject xml:lang="fr">Flux élongationnel</dc:subject>
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<dc:subject xml:lang="fr">Microparticules</dc:subject>
<dc:subject xml:lang="fr">Nanoparticules</dc:subject>
<dc:subject xml:lang="fr">Microbâtonnets</dc:subject>
<dc:subject xml:lang="fr">Latex</dc:subject>
<dc:subject xml:lang="en">Thioether</dc:subject>
<dc:subject xml:lang="en">Microfluidics</dc:subject>
<dc:subject xml:lang="en">Elongational flow</dc:subject>
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<dc:subject xml:lang="en">Microparticle</dc:subject>
<dc:subject xml:lang="en">Nanoparticle</dc:subject>
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<dc:subject xml:lang="en">Miniemulsion</dc:subject>
<dc:subject xml:lang="en">Latex</dc:subject>
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<dcterms:abstract xml:lang="fr">Les nanoparticules de poly(thioéther) constituent une classe de nanomatériaux qui pourraient convenir à de nombreuses applications telles que la nanomédecine, les revêtements ou l'analyse. Cependant, leur développement est limité par le faible contrôle de leur taille et de leur dispersité induit par les dispositifs conventionnels de cisaillement utilisés pour l'étape d'émulsification. Au cours de cette thèse, deux nouveaux dispositifs d'émulsification cyclique discontinue travaillant à basse pression et basés sur un écoulement élongationnel d'une solution thiol-ène/eau ont été utilisés pour produire, en conjonction avec un photoréacteur à flux continu, des nanoparticules monomodales en taille. Une étude approfondie a été menée pour quantifier les variations des caractéristiques des nanoparticules en fonction des paramètres matériaux (fonctionnalité et nature du thiol, quantité de photoamorceur, d'inhibiteurs de maturation d'Ostwald et de radicaux) ainsi que des paramètres de procédé (géométrie de l'élément de mélange, nombre de cycles). En outre, un nouveau dispositif à flux continu a été conçu, qui pourrait permettre la production de latex de thioéther en des quantités pré-industrielles. Enfin, un dispositif microfluidique a été utilisé pour obtenir des microparticules et des microbâtonnets de thioéther de taille contrôlable. Des recommandations ont pu être extraites des expériences pour aider au réglage des paramètres du procédé afin d’obtenir des particules d’une taille spécifique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Poly(thioether) nanoparticles composed a class of nanomaterials which could be suitable for many applications such as nanomedicine, coating or analytics. However, their development is impeded by the poor control on their size and dispersity induced by the conventional emulsification shear devices use for the emulsification step. In this research two batch novel cycling emulsification devices working under low pressure and based on the elongational-flow of a thiol-ene/aqueous solution were used to produce, in conjunction with a continuous-flow photoreactor, monomodal nanoparticles. A thorough study was conducted to quantify the variations of nanoparticles’ characteristics with changes in material parameters (functionality and nature of the thiol, amount of photoinitiator, of Ostwald ripening and radical inhibitors) as well as process parameters (geometry of the mixing element, number of cycle). Additionally, a novel continuous flow device was designed that could allow the production of thioether latex in pre-industrial scales. Finally, one microfluidic device was used to obtain thioether microparticles and microrods with controllable sizes. Useful guidelines were returned to tune the process parameters for targeting a specific particle’s size.</dcterms:abstract>
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