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Hydrogen-Bonding UCST-Thermosensitive Nanogels by Direct Photo-RAFT Polymerization-Induced Self-Assembly in Aqueous Dispersion

Abstract : Hydrogen-bonding upper critical solution temperature (UCST) thermosensitive nanogels based on poly(N-acryloyl glycinamide) (PNAGA) are synthesized by photo-reversible addition-fragmentation chain transfer mediated polymerization-induced self-assembly (photo-RAFT PISA) in aqueous dispersion using N,N′-methylenebis(acrylamide) as crosslinker and poly(oligo(ethylene glycol) methyl ether acrylate) as both stabilizer and macromolecular chain transfer agent (macro-CTA). Highly stable, spherical nanogels with narrow polydispersity are efficiently produced up to complete monomer conversion within 1 h under UV irradiation at low temperature (3 °C). The thermosensitive behavior of PNAGA-based nanogels, as assessed by dynamic light scattering and UV–vis spectrophotometry, exhibits reversible heating-induced swelling and cooling-induced shrinking corresponding to the expected UCST behavior. The hydrodynamic diameter, swelling ratio, and phase transition temperature of nanogels can be tuned by modifying the initial molar ratio of monomer-tomacro-CTA and the amount of crosslinker in the photo-RAFT PISA of NAGA
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https://hal-univ-lemans.archives-ouvertes.fr/hal-02860075
Contributeur : Laurent Fontaine <>
Soumis le : lundi 22 juin 2020 - 16:26:58
Dernière modification le : mardi 23 juin 2020 - 03:36:33

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Thi Tran, Sandie Piogé, Laurent Fontaine, Sagrario Pascual. Hydrogen-Bonding UCST-Thermosensitive Nanogels by Direct Photo-RAFT Polymerization-Induced Self-Assembly in Aqueous Dispersion. Macromolecular Rapid Communications, Wiley-VCH Verlag, 2020, ⟨10.1002/marc.202000203⟩. ⟨hal-02860075⟩

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