Unimolecular Benzodioxole-based Photoinitiators for Free Radical and Cationic Photopolymerization Under LED Light Irradiation

Compared to amines as coinitiators applied in photopolymerization, benzodioxole derivatives exhibit similar reactivity but less yellowing and lower toxicity. In this paper, a series of unimolecular type II photoinitiators, containing coumarins as chromophores and benzodioxoles as coinitiators, were...

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Bibliographic Details
Published in:Journal of Photopolymer Science and Technology 2022/12/16, Vol.35(2), pp.179-186
Main Authors: Li, Mengqi, Hu, Peng, Zhu, Junzhe, Liu, Ren, Li, Zhiquan
Format: Article
Language:English
Subjects:
Amines
Benzodioxole
Cationic polymerization
Chromophores
Coumarin
Free radical polymerization
Free radicals
LED photopolymerization
Light irradiation
Monomers
Photoinitiators
Photopolymerization
Toxicity
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Summary:Compared to amines as coinitiators applied in photopolymerization, benzodioxole derivatives exhibit similar reactivity but less yellowing and lower toxicity. In this paper, a series of unimolecular type II photoinitiators, containing coumarins as chromophores and benzodioxoles as coinitiators, were synthesized. The substituents with different electron donating/withdrawing abilities were designed for systematical investigation of structure-property relationship. Under LED irradiation, the novel photoinitiators can induce not only free radical polymerization of acrylate monomers, but also cationic polymerization of epoxy monomers via radical promoted cationic polymerization mechanism.
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.35.179