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Near‐Infrared Free‐Radical and Free‐Radical‐Promoted Cationic Photopolymerizations by In‐Source Lighting Using Upconverting Glass

Kocaarslan, Azra ; Tabanli, Sevcan ; Eryurek, Gonul ; Yagci, Yusuf

Angewandte Chemie (International ed.), 2017-11, Vol.56 (46), p.14507-14510 [Periódico revisado por pares]

Germany: Wiley Subscription Services, Inc

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  • Título:
    Near‐Infrared Free‐Radical and Free‐Radical‐Promoted Cationic Photopolymerizations by In‐Source Lighting Using Upconverting Glass
  • Autor: Kocaarslan, Azra ; Tabanli, Sevcan ; Eryurek, Gonul ; Yagci, Yusuf
  • Assuntos: Aniline ; Carbazole ; Cationic polymerization ; cationic polymerizations ; Cations ; Cyclohexene ; Fluorescein ; Free radical polymerization ; Free radicals ; I.R. radiation ; Irradiation ; Lighting ; near-infrared light ; Polymerization ; Polymethyl methacrylate ; Polyvinyl carbazole ; upconversion glass
  • É parte de: Angewandte Chemie (International ed.), 2017-11, Vol.56 (46), p.14507-14510
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: A method is presented for the initiation of free‐radical and free‐radical‐promoted cationic photopolymerizations by in‐source lighting in the near‐infrared (NIR) region using upconverting glass (UCG). This approach utilizes laser irradiation of UCG at 975 nm in the presence of fluorescein (FL) and pentamethyldiethylene triamine (PMDETA). FL excited by light emitted from the UCG undergoes electron‐transfer reactions with PMDETA to form free radicals capable of initiating polymerization of methyl methacrylate. To execute the corresponding free‐radical‐promoted cationic polymerization of cyclohexene oxide, isobutyl vinyl ether, and N‐vinyl carbazole, it was necessary to use FL, dimethyl aniline (DMA), and diphenyliodonium hexafluorophosphate as sensitizer, coinitiator, and oxidant, respectively. Iodonium ions promptly oxidize DMA radicals formed to the corresponding cations. Thus, cationic polymerization with efficiency comparable to the conventional irradiation source was achieved. Free‐radical and free‐radical‐promoted cationic polymerization is stimulated by in‐source lighting in the near‐infrared region. Yb3+/Tm3+ codoped tungsten–tellurite upconverting glass (UCG) irradiated by a laser, in the presence of fluorescein (FL) dye/amine and iodonium salt combinations, generates free radicals capable of initiating polymerization. Key: dimethyl aniline (DMA), pentamethyldiethylene triamine (PMDETA).
  • Editor: Germany: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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