Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose

Abstract : The objective of this research work consist in the elaboration of novel compositecoatings using cellulose nanocrystals (CNC) as biobased additives. To palliate the problem ofincompatibility between the hydrophilic filler and the hydrophobic matrices, a simple methodbased on vinyl esters was developed to functionalize the CNC surface. A preliminary studyperformed with vinyl acetate selected as model reactant first allowed optimizing the reactionconditions. This experimental protocol was subsequently extended to other functional vinylesters to confirm the versatility of the method. The unmodified and acetylated CNC weredispersed in acrylic polymers (latex) or polyurethane (cross-linked resin) matrices, to studytheir impact on the mechanical and barrier performances of the composites. An improvementof the mechanical and barrier properties could be observed in some cases, but the CNCacetylation did not improve further the performances. A bi-layer approach consisting in afilm of 100 % of acetylated CNC coated with the polymer was then envisaged, and allowedincreasing significantly the oxygen barrier properties of the different resins. Some of thefunctionalized CNC were incorporated into a polydimethylsiloxane matrix, for a potential useas protective aerospace coating. A significant improvement in thermal stability and in opticalstability under UV irradiation in geostationary conditions was then observed.
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Jérémie Brand. Fonctionnalisation chimique des nanocristaux de cellulose par acylation avec les esters de vinyle : impact sur les propriétés de revêtements chargés en nanocellulose. Polymères. Université de Bordeaux, 2016. Français. ⟨NNT : 2016BORD0318⟩. ⟨tel-01424226⟩

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