Nouveaux copolymères dérivés d'esters cellulosiques par polymérisation radicalaire contrôlée. Application à la purification du carbonate de diméthyle par un procédé de séparation par membrane

Abstract : This work deals with the synthesis of new copolymers of cellulose acetate grafted with poly(methyl diethylene glycol methacrylate) with different numbers and lengths of grafted chains by controlled radical polymerization (Atom Transfer Radical Polymerization ATRP). Two families of materials were obtained with the same compositions (between 20 and 50% in mass of grafted chains) but different architectures : a lot of short chains or a few long chains. These materials were then studied for the pervaporation separation of two aprotic/protic azeotropic mixtures : dimethyl carbonate/methanol and ethyl tert-butyl ether/ethanol. For the separation of the first mixture, copolymers had to be cross-linked but their mechanical withstanding was poor under stress and they showed high fluxes but very low selectivity. Nevertheless, the materials allowed to go over the thermodynamical azeotropic limit. For ethyl tert-butyl ether/ethanol separation, copolymers showed excellent performances with a very selective extraction of ethanol. The presence of grafted chains increased flux along with a slight decrease in selectivity compared with the cellulose acetate precursor. The analysis of the copolymer microstructure showed that copolymers with long grafted chains were more segregated than those with short grafted chains. The results of permeability showed different behaviours according to the copolymer architecture in good agreement with their microstructure
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Magali Heurtefeu. Nouveaux copolymères dérivés d'esters cellulosiques par polymérisation radicalaire contrôlée. Application à la purification du carbonate de diméthyle par un procédé de séparation par membrane. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL042N⟩. ⟨tel-01752995⟩

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