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Synthèse, formulation et caractérisation d’organogels aqueux moléculaires/macromoléculaires à base de produits bio-sourcés

Abstract : In that work, a natural amino acid, lysine, has been chemically modified for synthesizing three gelling agents with similar structures and differing from each other by one or two functional groups. All three molecules were fully soluble in dimethylsulfoxide (DMSO) and gelled DMSO/H2O mixtures with various compositions giving rise to aqueous organogels. Hydrogels could be produced after dialysis of DMSO/H2O gels. Mechanical strength of the gels, thermal/mechanical reversibility, temperature of gel-sol transition as well as kinetics of gel formation were analysed and correlated to the chemical structure of the gelators as well as to the composition of solvent. Semi-empirical equations were used to describe the experimental results. The results of visual observation, rheological measurements, FT-IR and Raman spectra were compared. We demonstrated that subtle variations in the chemical structure of the gelator dramatically modified some properties like the time for gel formation (which varied between 10 s and 1h30) or thermal reversibility. The formulation pathway must be adapted to the gelling behaviour of each molecule. In addition a specific geometry was designed for rheological measurements. The modification of gel properties by the addition of a non ionic polysaccharide (dextran, Mn ≈ 200,000 g.mol-1) was also investigated below and above its critical overlap concentration. According to the formulation of gels, their macroscopic properties could be adapted to specific applications.
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Submitted on : Friday, November 5, 2021 - 2:30:18 PM
Last modification on : Saturday, November 6, 2021 - 4:20:37 AM

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Géraldine Rangel Euzcateguy. Synthèse, formulation et caractérisation d’organogels aqueux moléculaires/macromoléculaires à base de produits bio-sourcés. Génie des procédés. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0300⟩. ⟨tel-03417018⟩

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