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Synthèse de copolymères amphiphiles triblocs BAB par PISA-RAFT dans l'eau

Abstract : Over the past decade, the polymerization-induced self-assembly (PISA) has become an efficient tool for the preparation of block-copolymer nanoparticles at high solid contents, in both organic solvents and water. Nonetheless, most of the studied systems are currently based on simple AB diblock copolymers (where A = solvophilic, stabilizer block and B = solvophobic block). Another interesting class of block copolymers are associative BAB triblocks. To the best of our knowledge, very few studies report their synthesis by PISA and the polymerizations are performed in mixtures of alcohol and water. In this work, for the first time, a straightforward strategy to synthesize, in pure water, BAB triblock copolymers through the use of reversible deactivation radical polymerization is developed and studied in details. To this end, an hydrophilic, bifunctional macroRAFT agent of poly(N,N-dimethylacrylamide) with a central benzoic acid group was used in the aqueous dispersion polymerization of diacetone acrylamide. Various morphologies (spheres, fibers and vesicles) could be obtained with good polymerization controls. Moreover, we showed that the particle morphology and colloidal stability strongly depend on the degree of ionization of the central charge in the stabilizer loop. Then, the mechanism of formation of these triblock copolymers during PISA was investigated. Finally, we showed the possibility to form dynamic networks of BAB copolymers – using a one-pot process entirely in water – leading to the formation of thermoresponsive copolymer networks with tunable viscosity.
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https://tel.archives-ouvertes.fr/tel-03463012
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Submitted on : Thursday, December 2, 2021 - 11:09:07 AM
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BIAIS_Pauline_these_2020.pdf
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  • HAL Id : tel-03463012, version 1

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Pauline Biais. Synthèse de copolymères amphiphiles triblocs BAB par PISA-RAFT dans l'eau. Polymères. Sorbonne Université, 2020. Français. ⟨NNT : 2020SORUS256⟩. ⟨tel-03463012⟩

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