期刊
MOLECULES
卷 26, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/molecules26061753
关键词
coumarin; free radical polymerization; LED; photocomposites; direct laser write
资金
- Association of Specialization and Scientific Guidance
- Centre National de la Recherche Scientifique
- Aix Marseille Universite
- Universite de Haute Alsace
- Agence Nationale de la Recherche (ANR agency) through the PhD grant of Guillaume Noirbent [ANR-17-CE08-0054]
Nine organic compounds based on the coumarin scaffold with different substituents were synthesized and used as efficient photoinitiators for free radical photopolymerization of meth(acrylate) groups under visible light irradiation. These compounds demonstrated high initiation capacity and good polymerization profiles, and were also tested in direct laser write experiments and the synthesis of photocomposites.
In this paper, nine organic compounds based on the coumarin scaffold and different substituents were synthesized and used as high-performance photoinitiators for free radical photopolymerization (FRP) of meth(acrylate) functions under visible light irradiation using LED at 405 nm. In fact, these compounds showed a very high initiation capacity and very good polymerization profiles (both high rate of polymerization (Rp) and final conversion (FC)) using two and three-component photoinitiating systems based on coum/iodonium salt (0.1%/1% w/w) and coum/iodonium salt/amine (0.1%/1%/1% w/w/w), respectively. To demonstrate the efficiency of the initiation of photopolymerization, several techniques were used to study the photophysical and photochemical properties of coumarins, such as: UV-visible absorption spectroscopy, steady-state photolysis, real-time FTIR, and cyclic voltammetry. On the other hand, these compounds were also tested in direct laser write experiments (3D printing). The synthesis of photocomposites based on glass fiber or carbon fiber using an LED conveyor at 385 nm (0.7 W/cm(2)) was also examined.
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