Photo-induced controlled radical polymerization with new Photocatalyst

  • Guo-Xiang Wang
  • Mu-sheng Liu
  • Enxiang Liang
  • Binhong He


Photo-induced electron transfer reversible addition-fragmentation chain transfer (PET RAFT) of methyl methacrylate (MMA) was investigated at 25 °C with rose bengal (4,5,6,7-tetrachloro-2′,4′,5′,7′-tetraiodofluorescein) (RB) as photoredox catalyst under visible light irradiation. The traditional chain transfer agent 4-cyanopentanoic acid dithiobenzoate (CPADB) was employed in this study. The kinetic curve of the photo-induced PET RAFT polymerization exhibited a good linear behavior. The number average molecular weights (Mn,GPC) of the poly(methyl methacrylate) (PMMA) increased linearly with respect to monomer consumption and they were in good agreement with the calculated values (Mn,th). At the same time the molecular weight distribution (Mw/Mn) was narrow. Temporal control of PET RAFT polymerization of MMA was demonstrated by “ON/OFF” experiments. The resulting PMMA was characterized by 1H–NMR, and GPC. The resultant PMMA could be used as macro-chain transfer agents for the PET RAFT radical polymerization. The chain experiments were successfully carried out and the living characteristics were demonstrated. The probable mechanism was discussed.


Living radical polymerization Photoinduced Photoelectron transfer Reversible addition-fragmentation chain transfer 



We thank the National Natural Science Foundation of China (51674117, 51503063), Scientific Research Fund of Hunan Provincial Education Department (Grant No 16 K036, 15B101).


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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Chemistry and Chemical EngineeringHunan Institute of Science and TechnologyYueyangChina
  2. 2.College of Life Science & Resources EnvironmentYichun UniversityYichunChina

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