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

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

PROGRESS IN ORGANIC COATINGS, vol.154, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 154
  • Publication Date: 2021
  • Doi Number: 10.1016/j.porgcoat.2021.106189
  • Journal Name: PROGRESS IN ORGANIC COATINGS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
  • Istanbul Technical University Affiliated: Yes

Abstract

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).