Thioxanthonation of Fluorenone: Visible Photoinitiator for Radical Polymerization

KARACA N., Balta D., OCAL N., ARSU N.

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol.54, no.7, pp.1012-1019, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 7
  • Publication Date: 2016
  • Doi Number: 10.1002/pola.27938
  • Journal Name: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1012-1019
  • Keywords: camphorquinone, laser flash photolysis, photopolymerization, photophysical properties, thioxanthone, EXCITED-STATE, II PHOTOINITIATOR, CURING BEHAVIOR, FLUORESCENCE, DERIVATIVES, ANTHRACENE, CARBAZOLE, GELATION, SYSTEMS
  • Yıldız Technical University Affiliated: Yes

Abstract

Thioxanthonation of fluorenone resulted in a new visible light initiator namely, indeno [1,2-b]thioxanthene-7,13-dione (TX-FN). The detailed photophysical properties of the singlet and the triplet excited states of TX-FN are reported using steady-state absorption, fluorescence, and phosphorescence, as well as laser flash photolysis techniques. Photoinitiated polymerization of MMA with TX-FN and CQ has been investigated in the presence and absence of a co-initiator (MDEA). Additionally, Photo-DSC studies were performed both in mono-and multiacrylate systems with TX-FN and parent compounds TX and FN. The obtained results were compared for formulations consisting of CQ. At low initiator concentrations, the conversions were lower than those obtained with TX-FN. (C) 2015 Wiley Periodicals, Inc.