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<dc:title xml:lang="fr">Synthèse de systèmes à dynamiques multiples pour l’auto-réparation</dc:title>
<dcterms:alternative xml:lang="en">Synthesis of multi-dynamic systems for self-healing</dcterms:alternative>
<dc:subject xml:lang="fr">Matériaux dynamique</dc:subject>
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<dc:subject xml:lang="fr">Coopérativité</dc:subject>
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<dcterms:abstract xml:lang="fr">La polycondensation de polybutadiènes amino-terminés sur un dérivé d'uréidopyrimidinone (UPy) fonctionnalisé par des aldéhydes conduit à l’obtention de matériaux polyimines présentant une dynamique double, autoréparant et recyclable. Ceux-ci présentent des propriétés mécaniques et d’auto-réparation supérieures aux références monodynamiques, démontrant ainsi une coopérativité, attribuée à un effet template entre les dynamiques supramoléculaires et covalentes. Une méthode de traitement numérique caractérisant les dynamiques a été développée. Des matériaux présentant des dynamiques entravées ainsi que des dynamiques spatialement espacées ont été étudiés ; la dynamique covalente s’en trouvant ralentie en comparaison. Un changement de topologie a été opéré. Les caractéristiques dynamiques de ce matériau sont uniques : en deçà de la Tv, les motifs supramoléculaires gouvernent la relaxation, tandis qu’au-delà, ce sont les échanges covalents. Proche de la Tv, la relaxation est la plus efficace, traduction d’une probable accélération synergétique. L’incorporation réussie de la dynamicité au sein de formulations méthacrylates photopolymérisables ouvre enfin de nouveaux champs d’applications.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The polycondensation of amino-terminated polybutadienes with aldehyde-functionalized ureidopyrimidinone (UPy) derivatives has led to self-healable, recyclable polyimine materials with dual dynamics. These materials exhibit mechanical and self-healing properties superior to monodynamic ones, proving cooperativity between the supramolecular and the covalent dynamics. A numerical method which characterizes the dynamics inside a material from relaxation curves has been developed. A material with a free competitive UPy moiety and a second one with the spaced dynamic moieties were studied. The dynamicity of imines was found to be significantly slowed.Change in topology was also achieved. The materials synthesized exhibited unique relaxation profiles: below Tv, the supramolecular units govern the relaxation while above Tv, covalent exchanges do. Around Tv, the relaxation is the most efficient, reflecting a strong acceleration via a probable synergistic mechanism. Successful incorporation of dynamicity in 3D printable formulations finally opens new horizons.</dcterms:abstract>
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