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Well-Defined Titanium Complex for Free-Radical and Cationic Photopolymerizations under Visible Light and Photoinduction of Ti-Based Nanoparticles
journal contribution
posted on 2019-05-08, 18:33 authored by Louise Breloy, Vlasta Brezová, Jean-Pierre Malval, Agustin Rios de Anda, Julie Bourgon, Takashi Kurogi, Daniel J. Mindiola, Davy-Louis VersaceA quinoline-derived titanium complex
(TiQ) is shown
here to possess remarkable photosensitizing properties when treated
with an iodonium salt (Iod) to initiate, under visible light irradiation,
(i) the free-radical photopolymerization of acrylate monomer in aerated/laminate
conditions, (ii) the cationic photopolymerization of epoxy monomer
under air, and (iii) the in situ formation of Ti-based nanoparticles
(NPs) inside coatings. The photochemical properties of the TiQ/Iod photoinitiating system have been probed by electron paramagnetic
resonance, laser flash photolysis, and real-time Fourier transform
infrared spectroscopy, which provide an insight into the possible
radical/cationic pathways. The microstructural properties of the photosynthesized
Ti-based NPs have been investigated by bright-field conventional transmission
electron microscopy and high-angle annular dark-field scanning transmission
electron microscopy. The macroscopic mechanical properties of the
resulting nanocomposite reveal that the generation of these Ti-based
NPs in a polyacrylate/polyether blend matrix leads to an increase
of mechanical resistance by toughening the matrix.
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Ti-based NPsfree-radical photopolymerizationcationic photopolymerizationTi-Based Nanoparticleslight irradiationacrylate monomermatrixIodquinoline-derived titaniumVisible Lightlaser flash photolysisCationic Photopolymerizationsiodonium saltTi-based nanoparticleshigh-angle annular dark-field scanning transmission electron microscopytransmission electron microscopyTiQphotosensitizing propertiesWell-Defined Titanium Complexphotosynthesized Ti-based NPsmicrostructural properties
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