期刊
EUROPEAN POLYMER JOURNAL
卷 132, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2020.109737
关键词
Ketones; Photoinitiating system; Free radical polymerization; Cationic polymerization; LED; Photolysis; 3D printing; Cyclohexanone
资金
- Region Grand Est for the grant MIPPI-4D
- Anhui Provincial Natural Science Foundation [1808085QB42]
- Natural Science Fund of Education Department of Anhui Province [KJ2018A0307]
- China Scholarship Council (CSC)
- Direction Generale de l'Armement (DGA)/Agence Innovation Defense (AID)
- Agence Nationale de la Recherche (ANR agency) [ANR-17-CE08-0054 VISICAT]
- Australian Research Council [FT170100301]
Six ketones (abbreviated as ketones 1-6) varying by the substitution pattern of the central cyclohexanones and the choice of the peripheral groups (thiophene or furane) were synthesized and proposed as unprecedented visible light sensitive photoinitiators, in combination with an amine and an iodonium salt, for the free radical polymerization of acrylates upon LED irradiation at 405 nm. For the photopolymerization of acrylates carried out as thin samples in laminate, all these ketones showed high photoinitiating abilities. Conversely, when tested as photoinitiators for thick samples, compared to the other 4 ketones, ketone 3 and ketone 5 both based onpiperidin-4-one as the central core and comprising furanes as peripheral groups proved to be the most efficient photoinitiators. Notably, the highest final polymerization conversion of Ebecryl 40, a tetrafunctional polyether acrylate, could be obtained using these two photoinitiators. The high photoreactivity of ketone 3 was highlighted by the steady state photolysis experiments. Meanwhile, ketone 3 could also promote the cationic polymerization of epoxides upon LED irradiation at 405 nm, in the presence of an iodonium salt. Interestingly, some 3D patterns could also be fabricated by free radical polymerization of Ebecryl 40 while using the ketone 3-based photoinitiating system.
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