Etude des propriétés rhéologiques et structurales d'hydrogels d'agarose chargés de nanowhiskers de cellulose

Abstract : Cellulose is the most abundant organic compound on Earth; it is composed of microfibrils, containing nanocrystalline regions, and amorphous regions. Cellulose nanocrystallites, called nanowhiskers, have been studied as reinforcement agents in polymer composites with thermoplastic matrix in numerous publications. However, the use of nanowhiskers to reinforce hydrogels has not really been explored up to now, despite potential interest in the formulation of green innovative hydrogels. The aim of this PhD thesis was to study the relationship between the structural state, on different length scales, and the rheological properties of hydrocolloid systems consisting of agarose hydrogels filled by cellulose nanowhiskers from tunicate, amarine animal. The experimental work performed in this thesis has shown that the reinforcing effect provided by the nanowhiskers could be marked, and could also be modulated by varying the density of electrical charges on the surface of nanowhiskers. Within the volume fraction range studied, that is less than 0.2%, the results have shown that the nanowhiskers could not percolate, and reinforcement effect was attributed to topological modifications of the agarose network, and to an efficient stress transfer between the matrix and the fillers, which interact via hydrogen bonds.The results obtained in this thesis improve the understanding of the mechanisms that govern there inforcement effect provided by the addition of cellulose nanofillers in a hydrogel matrix; they could also help to design innovative green hydrogels having good mechanical properties.
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Kévin Jacques Le Goff. Etude des propriétés rhéologiques et structurales d'hydrogels d'agarose chargés de nanowhiskers de cellulose. Autre. Université de Bretagne occidentale - Brest, 2014. Français. ⟨NNT : 2014BRES0108⟩. ⟨tel-02155233⟩

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