Macromolecular Rapid Communications 2015-12-01

Phenacyl Ethyl Carbazolium as a Long Wavelength Photoinitiator for Free Radical Polymerization.

Merve Kara, Sajjad Dadashi-Silab, Yusuf Yagci

Index: Macromol. Rapid Commun. 36 , 2070-5, (2016)

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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. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.