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Flavones as natural photoinitiators for light mediated free‐radical polymerization via light emitting diodes
Author(s) -
Al Mousawi Assi,
Garra Patxi,
Dumur Frédéric,
Graff Bernadette,
Fouassier Jean Pierre,
Lalevée Jacques
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20190044
Subject(s) - photopolymer , polymerization , visible spectrum , photochemistry , materials science , light emitting diode , radical polymerization , ultraviolet light , ultraviolet , polymer chemistry , chemistry , optoelectronics , polymer , composite material
In this work, we propose the use of flavones that can be derived from natural products as versatile high performance visible light photoinitiators initially with amino acid and later with iodonium salt and phosphino benzoic acid combinations for free‐radical polymerization acrylates of thin specimen (25 μm) and methacrylates thick specimen (1.4 mm) upon illumination with near ultraviolet light or visible light utilizing light emitting diodes (LED)@385 nm and LED@405 nm. High polymerization initiating capabilities are found with different hydroxyflavones and high final conversions of the reactive function are obtained. Their application as materials for three‐dimensional (3D) printing patterns is especially carried out for 1 mm thick 3D printed photopolymers. A full description of the comprised photochemical mechanisms is additionally given. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58 , 254–262