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Article Dans Une Revue ACS Macro Letters Année : 2022

Carbon Quantum Dot-Catalyzed, Highly Efficient Miniemulsion Atom Transfer Radical Polymerization Induced by Visible Light

Xiaoguang Qiao
Liang Qiao
  • Fonction : Auteur
Xi Zhang
  • Fonction : Auteur
Ge Shi
  • Fonction : Auteur
Yanjie He
  • Fonction : Auteur

Résumé

Owing to the benefits of using natural or artificial light sources as a stimulus, photoinduced reversible-deactivation radical polymerization (photoRDRP) techniques have been recognized to be a powerful "green" platform for the preparation of well-defined polymers. However, the development of highly efficient visible light-induced photoRDRP processes in aqueous dispersed media remains a challenge due to light scattering and refraction by monomer droplets or colloidal particles. In this work, an efficient green photocatalyst, carbon quantum dots (CQDs), was introduced to visible light-mediated miniemulsion atom transfer radical polymerization (ATRP), leading to highly efficient polymerizations with reaction rates (>80% monomer conversion within 1 h) much higher than in previous studies. This heterogeneous photocatalytic system is presumed to involve three catalytic cycles in (i) the aqueous phase, (ii) the oil−water interface, and (iii) the monomer droplets. The effect of different polymerization parameters on the polymerization reaction was investigated, including the amounts of surfactant and CQDs, CuBr 2 dosage, and solid content. Excellent temporal control of the polymerization was illustrated by "ON/OFF" polymerizations, and natural sunlight was also used as an energy source. This novel CQDs-catalyzed miniemulsion photoATRP process may be easily extended to other aqueous dispersion RDRP systems. As an extension of our previous work (J. Am. Chem. Soc. 2022, 144 (22), 9817−9826) we also developed a "one-pot" method for the rapid preparation of heterogeneous hydrogels.

Domaines

Polymères Catalyse
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Dates et versions

hal-03848738 , version 1 (17-11-2022)

Identifiants

Citer

Xiaoguang Qiao, Liang Qiao, Mengjie Zhou, Xi Zhang, Ge Shi, et al.. Carbon Quantum Dot-Catalyzed, Highly Efficient Miniemulsion Atom Transfer Radical Polymerization Induced by Visible Light. ACS Macro Letters, 2022, 11 (11), pp.1298-1305. ⟨10.1021/acsmacrolett.2c00542⟩. ⟨hal-03848738⟩
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