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Diels-Alder-Chitosan based dissociative covalent adaptable networks

Abstract : Four different films were prepared from chitosan modified with furfuryl glycidyl ether (FG) by Diels Alder reaction with different maleimide-based cross linker. At first, a preliminary study led to structural identification and better understanding of the reaction. For the first time, Diels-Alder and retro Diels-Alder reactions were evidenced by NMR spectroscopy and DSC on chitosan based systems. Then, chitosan of 30,000 g/mol and 150,000 g/mol were modified by FG with 20% substitution degree (DS). The resulting products were then cross-linked with bis and trimaleimide cross-linkers to produce films possessing interesting mechanical properties. For the first time for chitosan-based films, DMA measurement highlighted retro Diels-Alder between 110 and 130°C. Film also showed interesting hydrophobicity and fat absorption. They also exhibited resistance in acidic media whereas crude chitosan films were destroyed.
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https://hal.archives-ouvertes.fr/hal-02985047
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Soumis le : dimanche 1 novembre 2020 - 19:42:20
Dernière modification le : vendredi 6 novembre 2020 - 04:56:31

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Camille Chapelle, Baptiste Quienne, Céline Bonneaud, Ghislain David, Sylvain Caillol. Diels-Alder-Chitosan based dissociative covalent adaptable networks. Carbohydrate Polymers, Elsevier, 2021, 253, pp.117222. ⟨10.1016/j.carbpol.2020.117222⟩. ⟨hal-02985047⟩

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