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Nouveaux composés gélifiants supramoléculaires biosourcés : synthèse et caractérisation des gels dérivés

Abstract : This work is part of the continuation of work begun during previous theses of the laboratory on the design of low molecular weight gelling amphiphilic molecules, making it possible to obtain supramolecular gels. The first objective of this study corresponded to the synthesis of original derivatives associating 3 types of biosourced compounds, in this case glucose, lysine and fatty acids of variable chain length, all three of which are derived from plant biomass, with glucose from ligno-cellulosic biomass, lysine as a by-product of the sugar industry and fatty acids from vegetable oils. The proposed synthesis method is a direct method for each of the steps and avoids all protection/deprotection methods. The second objective was to highlight the gelling properties of these different compounds, by varying the solvent and concentration. Many gelling agents have shown ambidextrous properties, gelling water and organic solvents. The properties of the resulting supramolecular gels have been characterised by different techniques at the macroscopic level to determine the de-gelling temperatures, such as the inverted tube method or rheology, and at the microscopic level, such as microscopy. The interactions existing between the molecules and likely to be responsible for gel formation were highlighted by different spectroscopies (NMR, IR …), which led to the conclusion that the gelling process is governed by both hydrophobic interactions and hydrogen bonds.
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https://hal.univ-lorraine.fr/tel-03285437
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Submitted on : Tuesday, July 13, 2021 - 12:33:08 PM
Last modification on : Wednesday, July 14, 2021 - 3:17:16 AM

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  • HAL Id : tel-03285437, version 1

Citation

Cherryl Mirabelle Zang Ondo. Nouveaux composés gélifiants supramoléculaires biosourcés : synthèse et caractérisation des gels dérivés. Génie des procédés. Université de Lorraine, 2021. Français. ⟨NNT : 2021LORR0025⟩. ⟨tel-03285437⟩

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