2-mercapto thioxanthone as a chain transfer agent in free-radical polymerization: A versatile route to incorporate thioxanthone moieties into polymer chain-ends

KARASU F., Arsu N., YAGCI Y.

JOURNAL OF APPLIED POLYMER SCIENCE, vol.103, no.6, pp.3766-3770, 2007 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 103 Issue: 6
  • Publication Date: 2007
  • Doi Number: 10.1002/app.25467
  • Journal Name: JOURNAL OF APPLIED POLYMER SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3766-3770
  • Keywords: radical polymerization, photopolymerization, initiator, functionalization of polymers, mechanical properties, BLOCK-COPOLYMERS, MACROPHOTOINITIATORS, PHOTOINITIATOR, MACROMERS
  • Yıldız Technical University Affiliated: Yes

Abstract

2-Mercapto thioxanthone (TX-SH) was used as a chain transfer agent in free-radical polymerization of methyl methacrylate (MMA) and styrene (St), by using 2,2-azobisisobutyronitrile (AIBN) as an initiator at 70 degrees C. Chain transfer constants were found to be 1.41 and 0.12 for St and MMA, respectively. The use of TX-SH as a chain transfer agent leads to the formation of polymers with thioxanthone (TX) end groups. The incorporation TX moiety was confirmed by spectral measurements. Polymers obtained this way were used as triplet photosensitizer in free-radical polymerization of MMA in the presence of a hydrogen donor such as N-methyldiethanolamine (MDEA). (c) 2006 Wiley Periodicals, Inc.