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

Macromolecular rapid communications (2015-09-12)
Merve Kara, Sajjad Dadashi-Silab, Yusuf Yagci
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ethylene glycol dimethacrylate, 98%, contains 90-110 ppm monomethyl ether hydroquinone as inhibitor
Sigma-Aldrich
9-Vinylcarbazole, 98%
Sigma-Aldrich
9-Ethylcarbazole, 97%
Sigma-Aldrich
Potassium hexafluoroantimonate(V), 99%