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Theses

Formation et polymérisation d’émulsions de Pickering stabilisées par des nanocristaux de cellulose modifiés

Abstract : Pickering emulsions are based on amphiphilic particle stabilizers, which adsorb irreversibly at the liquid-liquid interface and form a rigid structure around the droplets. Amongst these particles, biosourced and biorenewable cellulose nanocrystals (CNCs) have demonstrated good performances as Pickering stabilizers for oil in water emulsions. In this thesis, a wide range of emulsions of monomers were stabilized by amphiphilic modified CNCs. These Pickering emulsions subsequently serve as vessel to perform radical polymerization. In a first step, the CNCs are modified to tailor the hydrophobic/hydrophilic balance and are used to efficiently stabilize direct (O/W), inverted (W/O) or double W/O/W Pickering emulsions of monomers. The different emulsions obtained were subsequently polymerized, by thermal radical polymerization or by SI-ATRP. The polymerization of the direct emulsions allowed producing either capsules or filled beads, depending on the monomer used, which we assigned to differences in monomer reactivity. Hence, the method offers the opportunity to tune the morphology of the polymerized spheres (empty or filled), by simply controlling the monomer conversion. The polymerization of the inverted emulsion on the other end, led to the formation of a porous material. The polymerization of the double W/O/W emulsions was also envisaged, leading original morphology such as small empty beads encapsulated into larger capsules.
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Arthur Werner. Formation et polymérisation d’émulsions de Pickering stabilisées par des nanocristaux de cellulose modifiés. Polymères. Université de Bordeaux, 2018. Français. ⟨NNT : 2018BORD0410⟩. ⟨tel-02119309⟩

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