Synthesis and evaluations of novel photoinitiators with side-chain benzophenone, derived from alkyl alpha-hydroxymethacrylates

Karahan O., Balta D., ARSU N., Avci D.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, vol.274, pp.43-49, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 274
  • Publication Date: 2014
  • Doi Number: 10.1016/j.jphotochem.2013.09.010
  • Journal Name: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.43-49
  • Keywords: Photopolymerization, Polymeric photoinitiator, Benzophenone, Synthesis, Alkyl alpha-hydroxymethacrylates, FREE-RADICAL POLYMERIZATION, COINITIATOR AMINE, MAIN-CHAIN, PHOTOPOLYMERIZATION, MOIETIES, THIOXANTHONE, POLYMERS, STATE
  • Yıldız Technical University Affiliated: Yes

Abstract

A novel monomeric photoinitiator, tert-butyl 2-((4-benzoylphenoxy)methyl)acrylate (1), with a side-chain benzophenone (BP) group was synthesized from tert-butyl alpha-bromo methacrylate (TBBr) and 4-hyroxybenzophenone. It was thermally homo- and copolymerized with a coinitiator, N,N-dimethylaminoethyl methacrylate (DMAEM), using free radical polymerization to give the corresponding polymeric photoinitiators (poly-1 and poly(1-co-DMAEM)). The polymeric photoinitiators showed similar UV absorption spectra to 1, which were red-shifted compared to BP. Photophysical studies such as phosphorescence and laser flash photolysis in addition to photopolymerization of methacrylates were performed. The photopolymerizations of triethylene glycol dimethacrylate (TEGDMA) and 1,6-hexanedioldiacrylate (HDDA) initiated by 1, poly-1, poly(1-co-DMAEM) and BP were studied by photo-DSC. The polymeric initiator (poly-1) was found to have higher efficiency than BP and monomeric initiatior 1. (C) 2013 Elsevier B.V. All rights reserved.