[Zurück]

E. Sari, M. Mitterbauer, R. Liska, Y. Yagci:
"Visible light induced free radical promoted cationic polymerization using acylsilanes";
Progress in Organic Coatings, 132 (2019), S. 139 - 143.

Within this work, a novel visible light photoinitiation system for cationic polymerization of oxiranes such as
cyclohexene oxide (CHO) and vinyl monomers such as isobutyl vinyl ether (IBVE) and N-vinylcarbazole (NVC)
using tetrakis(2,4,6-trimethylbenzoyl)silane (TTBS) is described. Polymerizations were successfully initiated at
room temperature upon irradiation in the visible region (λinc>400) in bulk or methylene chloride solutions of
these monomers and TTBS, in the presence of onium salts such as diphenyliodonium hexafluorophosphate
(Ph2I+PF6
−) and triphenylsulfonium hexafluorophosphate (Ph3S+PF−). Partial decomposition of TTBS by short
irradiation time and keeping the polymerization solution in the dark yielded poly(cyclohexene oxide) (PCHO)
bearing acyl silane terminal groups. Further use of the resultant polymer as photoinitiator in free radical
polymerization of MMA and free radical promoted cationic polymerizations of CHO yielded PCHO-b-PMMA and
chain extended PCHO, respectively.

Visible light, Photoinitiator, Acylsilane, Photopolymerization, Cationic polymerization

http://dx.doi.org/10.1016/j.porgcoat.2019.02.045

https://www.sciencedirect.com/science/article/pii/S0300944018310592?via%3Dihub