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An annelated thioxanthone as a new Type II initiator

Paper ID Volume ID Publish Year Pages File Format Full-Text
29096 44118 2008 6 PDF Available
Title
An annelated thioxanthone as a new Type II initiator
Abstract

5-Thia-naphthacen-12-one (TX-Np) was synthesized as a potential photoinitiator for radical polymerization. Polymerization studies revealed that TX-Np acts as a photoinitiator for radical polymerization of acrylic type monomers in the presence of N-methyldiethanolamine (MDEA). The phosphorescence spectrum measured at 77 K in ethanol showed an emission band at λmax = 505 nm corresponding to the approximate triplet energy of ca. 237 kJ/mol.The phosphorescence lifetime was found to be 197 ms corresponding to a π–π* nature of the lowest triplet state. The quantum yield for fluorescence emission (ϕf) in benzene was found to be 0.045. Spectroscopic and polymerization studies revealed that photoinitiation occurs through the α-aminoalkyl radical, similar to thioxanthone-based photoinitiators. Since MDEA is required for TX-Np to act as an initiator for acrylate polymerization, it is suggested that the TX-Np reacts with MDEA to give α-aminoalkyl radicals which initiate polymerization.

Keywords
Photopolymerization; Thioxanthone; Type II initiator
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 199, Issues 2–3, 25 September 2008, Pages 316–321
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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