UV-violet-blue LED induced polymerizations: specific photoinitiating systems at 365, 385, 395 and 405 nm

Jing Zhang, Nicolas Zivic, Frédéric Dumur, Pu Xiao, Bernadette Graff, Jean Pierre Fouassier, Didier Gigmes, Jacques Lalevée

Research output: Contribution to journalArticleResearchpeer-review

32 Citations (Scopus)

Abstract

Two naphthalimide derivatives (DMAENs) containing tertiary amine groups have been designed and synthesized. Upon exposure to near UV and visible LEDs (365 nm-455 nm), they lead to radicals without adding a hydrogen donor and, in combination with 2,4,6-tris(trichloromethyl)-1,3,5-triazine, an iodonium salt or N-vinylcarbazole, they produce radicals and cations. Compared to the well-known camphorquinone or bis(2,4,6-trimethylbenzoyl)-phenylphosphineoxide photoinitiator, the novel DMAENs containing photoinitiating systems are characterized by a very high reactivity for both the free radical polymerization of acrylates and the cationic polymerization of epoxides. This outstanding performance paves the way for polymerization in soft conditions (e.g. upon LED irradiation). The photochemical mechanisms are studied by Molecular Orbitals MO calculations, steady state photolysis, fluorescence, cyclic voltammetry, electron spin resonance spin trapping and laser flash photolysis techniques.

Original languageEnglish
Pages (from-to)6641-6648
Number of pages8
JournalPolymer
Volume55
Issue number26
DOIs
Publication statusPublished - 15 Dec 2014
Externally publishedYes

Keywords

  • LEDs
  • Naphthalimide derivatives
  • Near
  • Photoinitiator
  • UV and visible

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