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Published on: April 22, 2016
Phenacyl Ethyl Carbazolium as a Long Wavelength Photoinitiator for Free Radical Polymerization
Merve Kara1, Sajjad Dadashi-Silab1, Yusuf Yagci1,2
1Department of Chemistry, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey.
Abstract:
A new phenacyl-type photoinitiator based on ethyl carbazole as a long wavelength photo-initiator is developed for free radical polymerization. Phenacyl ethyl carbazolium hexafluoroantimonate (PECH) photoinitiator is synthesized in a two-step, one-pot manner by quaternizing ethyl carbazole with phenacyl bromide and subsequent ion exchange reaction with potassium hexafluoroantimonate. Under irradiation, PECH tends to undergo homolytic bond cleavage bringing about initiating free radicals. However, as evidenced by cyclic voltammetry and real-time photobleaching studies, formation of initiating cationic species is highly unlikely as the photochemically formed charged carbazole units tend to couple.
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