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Issue 7, 2013
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Design of new Type I and Type II photoinitiators possessing highly coupled pyrene–ketone moieties

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Abstract

New Type I and Type II photoinitiators based on 2,2-dimethoxy-2-phenylacetophenone (DMPA), benzophenone (BP) and thioxanthone (TX) linked to a pyrene (Py) moiety (Py_DMPA, Py_BP, Py_TX) are proposed here for the free radical polymerization of acrylates and the cationic polymerization of epoxides and vinylethers under a Xe–Hg lamp, laser diode at 405 nm or a halogen lamp. Excellent polymerization profiles using Py_DMPA and Py_BP are obtained, i.e. better than those recorded with the reference compounds (DMPA and BP). Specifically, Py_DMPA and Py_BP absorb in the near UV-visible range (360–420 nm range; absorption red-shift ∼15 nm), exhibit huge ε values (up to a 90 fold increase) and high photochemical reactivity. The mechanisms analyzed by electron spin resonance, steady state photolysis, fluorescence and laser flash photolysis experiments are discussed for the different initiating systems.

Graphical abstract: Design of new Type I and Type II photoinitiators possessing highly coupled pyrene–ketone moieties

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Article information


Submitted
09 Dec 2012
Accepted
24 Jan 2013
First published
25 Jan 2013

Polym. Chem., 2013,4, 2313-2324
Article type
Paper

Design of new Type I and Type II photoinitiators possessing highly coupled pyrene–ketone moieties

M. Tehfe, F. Dumur, B. Graff, F. Morlet-Savary, D. Gigmes, J. Fouassier and J. Lalevée, Polym. Chem., 2013, 4, 2313
DOI: 10.1039/C3PY21079K

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