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Diphenyl Functional Porphyrins and Their Metal Complexes as Visible-Light Photoinitiators for Free-Radical, Cationic and Thiol-Ene Polymerizations

Abstract

This investigation demonstrates the excellent photoinitiating properties of novel visible-light absorbing diphenylporphyrins (DPPs) for the free-radical (FRP), cationic (CP) and thiol-ene polymerizations under visible LEDs 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 electron donor and participate in H-abstraction reaction when combined with iodonium salt (Iod), N-methyldiethanol amine (MDEA) or thiol derivative, respectively.

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Supplementary files

Article information


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

Polym. Chem., 2020, Accepted Manuscript
Article type
Paper

Diphenyl Functional Porphyrins and Their Metal Complexes as Visible-Light Photoinitiators for Free-Radical, Cationic and Thiol-Ene Polymerizations

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

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