Push–pull (thio)barbituric acid derivatives in dye photosensitized radical and cationic polymerization reactions under 457/473 nm laser beams or blue LEDs
作者： Mohamad-Ali Tehfe , Frédéric Dumur , Bernadette Graff , Fabrice Morlet-Savary , Didier Gigmes
DOI: 10.1039/C3PY00372H
关键词:
摘要: A series of new dyes based on (thio)barbituric acid derivatives were synthesized and used as photoinitiators polymerization upon very soft irradiation (laser diodes at 457 nm 473 nm; blue LED bulbs or even a halogen lamp). These can work according to an oxidative cycle (dye/diphenyl iodonium salt/N-vinylcarbazole system) reductive (dye/amine/alkyl halide partly behave organic photocatalysts. Ring-opening (ROP) epoxides radical (RP) acrylates are easily promoted. Excellent RP and/or ROP profiles obtained. The contrasting behavior the thiobarbituric vs. barbituric derivative is discussed. initiation mechanisms, analyzed by Electron Spin Resonance (ESR) steady state photolysis experiments, detailed.
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