Highly conjugated visible and near-infrared light photoinitiating systems for radical and cationic polymerizations

[Display omitted] •Novel highly conjugated thiophene derivatives as visible and NIR light sensitizers.•Photoinduced electron transfer reactions between iodonium salt and sensitizers.•Use of incandescent infrared light, photosensitizers and diphenyl iodonium salt for photopolymerization of various mo...

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Bibliographic Details
Published in:Progress in organic coatings 2021-05, Vol.154, p.106189, Article 106189
Main Authors: Suerkan, Ali, Alkan, Ecem Aydan, Kaya, Kerem, Udum, Yasemin Arslan, Toppare, Levent, Yagci, Yusuf
Format: Article
Language:English
Subjects:
Cationic polymerization
Conjugated molecules
Cyclohexene
Electron transfer
Free radical polymerization
Free radicals
Glycol dimethacrylates
Infrared radiation
Monomers
Near-infrared sensitization
Onium salts
Photo-induced electron transfer
Photoinitiators
Polymethyl methacrylate
Radical polymerization
Thiophenes
Triethylene glycol dimethacrylate
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Summary:[Display omitted] •Novel highly conjugated thiophene derivatives as visible and NIR light sensitizers.•Photoinduced electron transfer reactions between iodonium salt and sensitizers.•Use of incandescent infrared light, photosensitizers and diphenyl iodonium salt for photopolymerization of various monomers.•Ability to form hybrid cross-linked polymers. In this communication, we report highly conjugated thiophenes having [1,2,5]-thiadiazolo and [1,2,5]-selenadiazolo [3,4-f]-benzo [1,2,3] triazole in conjunction with diphenyliodonium hexafluorophosphate salt (DPI) as new visible and near-infrared light (NIR) photoinitiator systems for free radical (FRP) and cationic polymerizations (CP). The postulated mechanism is based on the electron transfer reactions between the excited conjugated molecule and DPI ions. The radicals and Bronsted acid formed this way initiate FRP and CP of appropriate monomers such as methylacrylate (MA), methyl methacrylate (MMA), triethylene glycol dimethacrylate (TEGDMA) and cyclohexene oxide (CHO), isobutyl vinylether (IBVE) respectively. The possibility of in situ hybrid polymerization is also demonstrated using bifunctional monomer glycidyl methacrylate (GMA).
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2021.106189