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Theses

Surface modification of cellulose nanocrystals by esterification and ATRP reactions for advanced applications

Abstract : In this thesis, the surface functionalization of cellulose nanocrystals (CNC) by esterification and ATRP reactions was envisaged, with the objective to develop novel advanced materials. A convenient method to characterize the polymers grafted on CNC by Si-ATRP has been first developed, based on DLS, DSC and TGA analyses. The efficiency of the SI-ATRP and SI-ARGET ATRP methods to initiate the grating of polystyrene (PS) or poly(4-vinylpyridine) (P4VP) at the CNC surface were then compared. The pH-responsive P4VP-g-CNC nano-hybrids were subsequently utilized to stabilize gold nanoparticles (AuNPs), in view of producing recyclable catalysts. The catalytic activity of the Au@P4VP-g-CNC material – tested with the reduction of 4-nitrophenol – was significantly improved compared with single AuNPs. UV-responsive poly(cinnamoyloxy ethyl methacrylate) (PCEM) polymers were also grafted on CNC, to produce particles with UV absorbing properties. The PCEM-g-CNC nano-hybrids obtained turned out to be efficient UV/thermal stabilizers and reinforcing agents in PVC films. Finally, a facile method to prepare colloidosomes from w/o inverse Pickering emulsions stabilized by cinnamate-modified CNC was proposed. Colloidosomes with robust shells and allowing the slow release of encapsulated molecules such as rhodamine B or fluorescent deoxyribonucleic acid were then obtained.
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Zhen Zhang. Surface modification of cellulose nanocrystals by esterification and ATRP reactions for advanced applications. Polymers. Université de Bordeaux, 2017. English. ⟨NNT : 2017BORD0653⟩. ⟨tel-01685016⟩

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