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Issue 26, 2020
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Diphenyl functional porphyrins and their metal complexes as visible-light photoinitiators for free-radical, cationic and thiol–ene polymerizations

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Abstract

This investigation demonstrates the excellent photoinitiating properties of novel visible-light absorbing diphenylporphyrins (DPPs) for free-radical (FRP), cationic (CP) and thiol–ene polymerizations under visible LED irradiation (405 and 530 nm) at low intensities, under air or in laminate. Kinetics results on FRP and CP showed that DPPs are much more efficient photoinitiators than common Type II photosensitizers, i.e. camphorquinone or benzophenone. As confirmed by EPR and laser flash photolysis studies, DPPs play a dual role as an electron donor and in the H-abstraction reaction when combined with iodonium salt (Iod), N-methyldiethanol amine (MDEA) or thiol derivative, respectively.

Graphical abstract: Diphenyl functional porphyrins and their metal complexes as visible-light photoinitiators for free-radical, cationic and thiol–ene polymerizations

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Article information


Submitted
30 Mar 2020
Accepted
06 May 2020
First published
07 May 2020

Polym. Chem., 2020,11, 4237-4249
Article type
Paper

Diphenyl functional porphyrins and their metal complexes as visible-light photoinitiators for free-radical, cationic and thiol–ene polymerizations

H. Marcille, J. Malval, M. Presset, N. Bogliotti, A. Blacha-Grzechnik, V. Brezová, Y. Yagci and D. Versace, Polym. Chem., 2020, 11, 4237
DOI: 10.1039/D0PY00468E

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