Benzoin type photoinitiator for free radical polymerization. Issue 8 (7th February 2013)

• Record Type: Journal Article
• Authors: Esen, Duygu Sevinc; Arsu, Nergis; Da Silva, José P.; Jockusch, Steffen; Turro, Nicholas J.
• Is Part Of: Journal of polymer science. Volume 51:Issue 8(2013:Apr.)
• Page Start: 1865
• Page End: 1871
• Publication Date: 2013-02-07
• Subjects: 547
• DOI: 10.1002/pola.26569
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Benzoin, a popular photoinitiator for free radical polymerization of vinyl monomers, was improved by introduction of two methyl thioether substituents. This new benzoin derivative showed an about 50 times higher light absorption in the near‐UV spectral region and performed better than the unsubstituted benzoin in polymerization experiments in bulk solutions or films of acrylate monomers when low initiator concentrations are used. Laser flash photolysis, low temperature luminescence experiments and photoproduct studies by mass spectrometry suggest that a slow α‐cleavage mechanism (<italic>k</italic>_α = 2.2 × 10⁵ s⁻¹) from the electronic triplet state with a quantum yield of 0.1 is the primary photoreaction to generate the initiating free radicals. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013</p> </abstract>