One-component bimolecular photoinitiating systems, 2 - Thioxanthone acetic acid derivatives as photoinitiators for free radical polymerization

AYDIN M., Arsu N., YAGCI Y.

MACROMOLECULAR RAPID COMMUNICATIONS, vol.24, no.12, pp.718-723, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 12
  • Publication Date: 2003
  • Doi Number: 10.1002/marc.200300019
  • Journal Name: MACROMOLECULAR RAPID COMMUNICATIONS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.718-723
  • Keywords: electron transfer, initiators, photopolymerization, radical polymerization, thioxanthone, PHOTOSENSITIZED DECARBOXYLATION, CARBOXYLIC-ACIDS
  • Yıldız Technical University Affiliated: Yes

Abstract

The compounds 2-thioxanthone-thioacetic acid and 2-(carboxymethoxy)thioxanthone, bimolecular photoinitiators for free radical polymerization, are synthesized and characterized. Their capability to act as initiators for the polymerization of methyl methacrylate was examined. The postulated mechanism is based on the intermolecular electron-transfer reaction of the excited photoinitiator with the sulfur or oxygen atom of the ground state of the respective photoinitiator followed by decarboxylation. The resulting alkyl radicals initiate the polymerization.