A New Three-Component Photo-Initiating System for Visible Light Recording of Volume Holograms with Single-Pulsed Laser
| Autor: | Thomas Fäcke, Sven Hansen, Brita Wewer, Thomas Rölle, Koichi Kawamura, Horst Berneth, Lena Pitzer, Friedrich Bruder, Stephan Kern |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Radical Radical polymerization Organic chemistry General Chemistry Electron acceptor Photochemistry Laser radical polymerization Article law.invention Electron transfer Photopolymer photo polymerization QD241-441 chemistry law pulsed laser holographic recording Alkyl Visible spectrum |
| Zdroj: | Polymers, Vol 13, Iss 3517, p 3517 (2021) Polymers Volume 13 Issue 20 |
| ISSN: | 2073-4360 |
| Popis: | Versatile substituted electron-deficient trichloromethylarenes can easily be synthesized and combined with a Safranine O/triarylalkylborate salt to form a highly efficient three-component photo-initiation system that starts free radical polymerization to finally form holographic gratings with a single-pulsed laser. The mechanism of this photo-initiation most likely relies on an electron transfer from the borate salt into the semi-occupied HOMO of the excited dye molecule Safranine O, which after fragmentation generates an initiating alkyl radical and longer-lived dye radical species. This dye radical is most probably oxidized by the newly introduced trichloromethylarene derivative as an electron acceptor. The two generated radicals from one absorbed photon initiate the photopolymerization and form index gratings in a suitable holographic recording material. This process is purely photonic and does not require further non-photonic post treatments. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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