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Synthèse de polyhydroxyuréthanes biosourcés par extrusion réactive : élaboration de matériaux aux propriétés originales

Abstract : This thesis work deals with the application of reactive extrusion to the bulk synthesis of polyhydroxyurethanes (PHUs). On the one hand, thermoplastic PHUs have been synthesized from three biobased 5-membered biscyclic carbonates, two of them being ester- or ether- chemically ‘activated’. The complete conversion of reactive functions has been reached in most cases, in relatively short reaction times (few hours), despite very cohesive systems, specifically in the case of one biscyclic carbonate bearing amide moieties. On the other hand, thermosets PHUs with shape memory capacity and reprocessability have been synthesized through this process. Simultaneously, a study was performed on model reactions in order to determine the experimental conditions that limit urea formation during the aminolysis of biscyclic carbonates. Finally, a purification protocol was developed in order to separate the two enantiomers of DGDC biscyclic carbonate. The polymerization of these two separated enantiomers with diamines demonstrated that the stereochemistry of biscyclic carbonate monomers plays a crucial role in the final polymer size and properties.
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Fiona Magliozzi. Synthèse de polyhydroxyuréthanes biosourcés par extrusion réactive : élaboration de matériaux aux propriétés originales. Polymères. Université de Bordeaux, 2019. Français. ⟨NNT : 2019BORD0290⟩. ⟨tel-02890242⟩

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