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


Creative Commons License

Suerkan A., Alkan E. A. , Kaya K., UDUM Y., TOPPARE L. K. , Yağcı Y.

Progress in Organic Coatings, vol.154, 2021 (Journal Indexed in SCI Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 154
  • Publication Date: 2021
  • Doi Number: 10.1016/j.porgcoat.2021.106189
  • Title of Journal : Progress in Organic Coatings

Abstract

© 2021 Elsevier B.V.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).