A Thioxanthone-Based Visible Photoinitiator

Dogruyol S., Dogruyol Z., ARSU N.

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol.49, no.18, pp.4037-4043, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 49 Issue: 18
  • Publication Date: 2011
  • Doi Number: 10.1002/pola.24846
  • Journal Name: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4037-4043
  • Keywords: initiators, photochemistry, photopolymerization, FREE-RADICAL POLYMERIZATION, CHAIN THIOXANTHONE, PHOTOPOLYMERIZATION, COINITIATOR, MACROPHOTOINITIATOR, PHOTOCHEMISTRY, METHACRYLATE, GELATION, AMINE, ACID
  • Yıldız Technical University Affiliated: Yes

Abstract

Thioxanthone-based 9-(2-Morpholine-4yl-acetyl)-5-thia-napthasen-12-one (TX-MPM) was synthesized and characterized as a one-component novel visible photoinitiator. Its capability to act as an initiator for the polymerization of methyl methacrylate (MMA) was examined in photoreactor and also daylight. Photophysical properties: fluorescence and phosphorescence emission spectra and fluorescence quantum yield of TX-MPM (Phi(f) = 0.29) were determined. The phosphorescence lifetime was found 131 ms for TX-MPM and 110 ms for initiator-attached polymer (PMMA) at 77 K, indicated a pi ->pi* nature of the lowest triplet state. A model compound, morpholino acetonapthone was used as quencher for the triplet states of TX-MPM and the quenching rate constant was determined (k(q) = 1.26 x 10(9) M(-1)s(-1)). According to laser flash photolysis studies, intermolecular hydrogen abstraction process was more dominant path to the formation of the initiating radicals. (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 4037-4043, 2011