Polyuréthanes et polyurées à base de cyclodextrines, synthèses en milieu solvant et dioxyde de carbone supercritique: vers de nouveaux polymères supramoléculaires

Abstract : This work aims at obtaining a polymeric material possessing complexation abilities thanks to cyclodextrins (CyD) within its framework and demonstrating the feasibility of the synthesis in supercritical CO2 medium (scCO2). Contrary to liquid medium, the polymerization of [alpha]-CyD and a diisocyanate in scCO2 shows only low conversion after 7 hours due to the possible complexation of the diisocyanate by the CyD, the insolubility of the CyD in scCO2 medium or insufficient time to achieve high conversion due to diminution of the reaction rate. New studies have to be done in order to confirm these hypothesis. The design of an original monomer which could be soluble in scCO2 thanks to acetyl groups fixed on the CyD and functionalized by 3 isocyanates, leads to a strong dependency of the molar mass with the concentration of monomers (up to 16.89 kg/mol at 50 %w of monomers) when reacted with a diaminoalkyle chain extender in solvent medium. In scCO2 medium, full conversion of this monomer is achieved, with higher molar masses obtained than in liquid medium at the same concentration. This demonstrates the potential of such a synthesis medium instead of organic solvents when design is well adapted. However, more experiments are needed to study the influence of concentration, temperature and pressure on larger scales to conclude in the interest of scCO2
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Cédric Couturier. Polyuréthanes et polyurées à base de cyclodextrines, synthèses en milieu solvant et dioxyde de carbone supercritique: vers de nouveaux polymères supramoléculaires. Alimentation et Nutrition. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0291⟩. ⟨tel-01751374⟩

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