Utilisation de la fonction (méth) acrylique pour accéder à de nouveaux liquides ioniques

Abstract : This manuscript presents the synthesis of various new Ionic Liquids (IL) from (meth)acrylic compounds. IL structure provides them unusual properties (chemical and thermal stability, low vapour pressure, high ionic conductivity ), which enable their use in many fields of chemistry. However IL cost and availability, particularly for IL with an unusual function in their side chain, are two drawbacks slowing down their use in protocols on an industrial scale. The first goal of this work was to develop a simple, fast and effective synthesis of ILs which present a carboxylic acid function at the end of the side chain as well as fluorinated counter-anions (BF4, PF6 and NTf2). We have therefore performed a Michael addition of N-methylimidazole on the conjugated double bond of acrylic acid in the presence of related hydrogen fluoride. One of the key challenges of the moment is the preparation of electrolyte polymers for next-generation battery from ILs with a polymerizable function. But even if starting ILs have a high ionic conductivity, the latter drops considerably after polymerization. To circumvent the problem, we synthesized various ILs with a (meth)acrylate function which could present as high as possible ionic conductivity. So we have varied counter-ions, monomer nature (anionic or cationic), and introduced a sulfur atom in the side chain to increase IL flexibility in order to improve ionic conductivity.
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Julie Harmand. Utilisation de la fonction (méth) acrylique pour accéder à de nouveaux liquides ioniques. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ032S⟩. ⟨tel-01752599⟩

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