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<dc:title xml:lang="fr">Polymérisation click pour la préparation de polymères et d'élastomères mésogènes</dc:title>
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<dc:subject xml:lang="fr">Cristaux liquides</dc:subject>
<dc:subject xml:lang="fr">Chimie click</dc:subject>
<dc:subject xml:lang="fr">Alcynes</dc:subject>
<dc:subject xml:lang="fr">Dérivés azurés</dc:subject>
<dc:subject xml:lang="fr">Triazoles</dc:subject>
<dc:subject xml:lang="fr">Polymères</dc:subject>
<dc:subject xml:lang="fr">Elastomères</dc:subject>
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<dc:subject xml:lang="en">Liquid crystals</dc:subject>
<dc:subject xml:lang="en">Click chemistry</dc:subject>
<dc:subject xml:lang="en">Alkynes</dc:subject>
<dc:subject xml:lang="en">Azides</dc:subject>
<dc:subject xml:lang="en">Triazoles</dc:subject>
<dc:subject xml:lang="en">Polymers</dc:subject>
<dc:subject xml:lang="en">Elastomers</dc:subject>
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<tef:elementdEntree autoriteExterne="030603471" autoriteSource="Sudoc">Polymères cristaux liquides</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="032771908" autoriteSource="Sudoc">Cyclopolymérisation</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Nous avons développé une stratégie de synthèse basée sur la cycloaddition 1,3‐dipolaire catalysée par le Cu(I) pour la préparation de LCPs et LCEs. Nous avons considéré deux approches. La première consiste en l’élaboration des monomères (protomésogènes) portant des fonctionnalités alcynes terminaux et des molécules portant des groupements azurés suivi de leur réaction selon un procédé en une seule étape. Dans la seconde approche, la formation du "protomésogène" se fait in situ lors de la réaction de cycloaddition (polymerisation) à partir de blocs complémentaires portant des fonctionnalités alcynes et azurés. Tous les composés synthétisés ont été caractérisés par des techniques classiques d'analyses chimiques ou physiques (élastomères). Dans tous les cas, les analyses thermiques (ATG et DSC) ont été menées afin de déterminer l’existence de mésophases et la stabilité des produits, et le cas échéant, les propriétés mésomorphes ont été analysées par POM et SAXS.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this work we have developed a new strategy based on the Cu(I)‐catalyzed 1,3‐dipolar cycloaddition between azides and alkynes for the preparation of a variety of LCPs and LCEs. Two approaches are presented. The first one consists in clicking together appropriate alkyne‐difunctionalized potential mesogens with azide‐difunctionalized spacers (polymers) and crosslinker (elastomers) in a one‐pot procedure. In an alternative approach, the potential mesogens are formed in situ during the polymerization procedure by cliking prefunctionalized building blocks bearing alkyne and azide functions. All of the samples were chemically or physically (elastomers) characterized by typical analysis. Their thermal behavior was investigated by using techniques such as ATG and DSC and where necessary (mesomorphic materials) by using POM and SAXS.</dcterms:abstract>
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