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Elaboration de réseaux polyuréthanes hybrides réparants et thermoformables

Abstract : This work deals with the elaboration and the characterization of new hybrid dynamic polyurethane networks. Both healing, and even recyclability, and thermoforming of polymer materials are aimed. These properties are based on the chemical ionocovalent bond reversibility in the crosslinked network.Indeed, the used of an inorganic component, here the polydibutyltitanate, brings not only about crosslinking between tetravalent titanium Ti4+ and dangling carboxylic acid functions on the polyurethane, but also about dynamic properties through the bonds reversibility at the hybrid interface. Such hybrid interactions are strong enough to crosslink the macromolecular chains and labile enough to ensure dynamic exchange inside hybrid material over a certain temperature. Moreover, the redistribution of the bonds enables the network to rearrange without any loss of its integrity. Study of mechanical properties through DMTA, uniaxial tensile tests and stress relaxation or creep experiments highlight the dynamic properties of the network at a macroscopic scale. This fast multifactorial dynamic is based on an associative exchange, leading to a network integrity. This works is completed by a study of high humidity rate on materials properties and by an opening up to other polyurethane matrices to increase materials modulus.
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Alice Tonnelier. Elaboration de réseaux polyuréthanes hybrides réparants et thermoformables. Polymères. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS544⟩. ⟨tel-03125321⟩

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