Soft Photopolymerizations Initiated by Dye-Sensitized Formation of NHC-Boryl Radicals under Visible Light
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- 作者：Sofia Telitel ; St茅phane Schweizer ; Fabrice Morlet-Savary ; Bernadette Graff ; Th茅ophile Tschamber ; Nicolas Blanchard ; Jean Pierre Fouassier ; Moreno Lelli ; Emmanuel Lac么te ; Jacques Lalev茅e
- 刊名：Macromolecules
- 出版年：2013
- 出版时间：January 8, 2013
- 年：2013
- 卷：46
- 期：1
- 页码：43-48
- 全文大小：311K
- 年卷期：v.46,no.1(January 8, 2013)
- ISSN：1520-5835
文摘
A procedure for the production of N-heterocyclic carbene鈥揵oryl radicals (NHC-BH2鈥?/sup>) upon visible light irradiation under soft conditions is presented. New acridine orange (dye)/diphenyl disulfide/NHC鈥揃H3 and dye/sulfonium salt/NHC鈥揃H3 three-component initiating systems are introduced for the efficient visible light photopolymerization of trimethylolpropane triacrylate. The new systems could be extendend to polymerization reactions in water (hydroxyethyl acrylate and hydroxyethyl methyl acrylate), which proceeded with strongly improved polydispersity. The chemical mechanisms are investigated through EPR and photolysis experiments.