NIR-Sensitized Photopolymerization with Iodonium Salts Bearing Weak Coordinating Anions

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]-,...

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Published inJournal of Photopolymer Science and Technology Vol. 29; no. 4; pp. 609 - 615
Main Authors Shiraishi, Atsushi, Ueda, Yasuhiro, Schlapfer, Michael, Schmitz, Christian, Bromme, Thomas, Oprych, Dennis, Strehmel, Bernd
Format Journal Article
LanguageEnglish
Published The Society of Photopolymer Science and Technology(SPST) 01.01.2016
Subjects
cationic
iodonium
NIR
radical
sensitizer
weak coordinating
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Summary: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)2N]-, 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)2N]- exhibit an excellent solubility being larger than several 100 g L-1. Furthermore, NIR sensitized cationic photopolymerization of aziridines was successfully demonstrated.
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.29.609