Development of Novel Photoinitiators as Substitutes of Camphorquinone for the LED Induced Polymerization of Methacrylates: A Bis‐Silyl Ketone. Issue 13 (16th September 2016)

• Record Type: Journal Article
• Authors: Graff, Bernadette; Klee, Joachim E.; Fik, Christoph; Maier, Maximilian; Fouassier, Jean Pierre; Lalevée, Jacques
• Other Names: Boyer C. A. guestEditor.; Miyake G. M. guestEditor.
• Is Part Of: Macromolecular rapid communications. Volume 38:Issue 13(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-09-16
• Subjects: bis‐silylketone -- camphorquinone -- dental composites -- photoinitiator -- silyl radicals; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201600470
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract : A new photoinitiator based on a bis‐silylketone (BSK) structure is proposed as a novel compound leading to highly efficient initiating silyl radicals for the polymerization of methacrylates (e.g., a bisphenol A‐glycidyl methacrylate/triethyleneglycol dimethacrylate blend (70%/30% w/w)) upon exposure to a blue light emitting diode and a green laser diode. The polymerization profiles are recorded by real time Fourier transform IR (FTIR) spectroscopy. Absorption, fluorescence, electron spin resonance (ESR), and steady state experiments are used to investigate the involved chemical mechanisms. Molecular orbital calculations are also carried out. Remarkably, BSK efficiently works in the presence of an iodonium salt. The overall mechanism for the initiation step is clarified. This novel class of silyl radical generating photoinitiators is really promising for the photopolymerization of methacrylates, e.g., in dental materials. Abstract : A new photoinitiator based on a bis‐silylketone structure is proposed. This novel class of silyl‐radical‐generating photoinitiators is very promising for the photopolymerization of methacrylates under blue‐light‐emitting diode light, for example, in dental materials.