Journal
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
Volume 29, Issue 4, Pages 609-615Publisher
TECHNICAL ASSOC PHOTOPOLYMERS,JAPAN
DOI: 10.2494/photopolymer.29.609
Keywords
NIR; sensitizer; iodonium; weak coordinating; radical; cationic
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Funding
- BMBF (project MoMaDruDig) [03FH022PX4]
- Niederrhein University of Applied Sciences
- county of North Rhine Westfalia within the program of scientific instruments
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Photoinitiated Polymerization of TPGDA was initiated with a NIR LED emitting at 790 nm using a redox based photoinitiator system comprising a cyanine as photosensitizer and a diaryl iodonium salt. The latter bears different anions exhibiting low coordination behavior; that is [B(Ph)(4)](-), [B(PhF5)(4)](-), [B(Ph(CF3)(2))(4)](-), [B(Ph-4-Cl)(4)](-), [(CF3SO2)(2)N](-), PF6-, and [PF3(C2F5)(3)](-). Photo-DSC was applied to determine photopolymerization activity. This correlated with the conductivity with many of these anions showing that reactivity mostly correlates with ion mobility. Nevertheless, iodonium salts bearing as anions either [PF3(C2F5)(3)](-), [B(Ph(CF3)(2))(4)](-) or [(CF3SO2)(2)N](-) exhibit an excellent solubility being larger than several 100 g.L-1. Furthermore, NIR sensitized cationic photopolymerization of aziridines was successfully demonstrated.
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