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Well-Defined Titanium Complex for Free-Radical and Cationic Photopolymerizations under Visible Light and Photoinduction of Ti-Based Nanoparticles

By Louise Breloy (6681392), Vlasta Brezová (1585822), Jean-Pierre Malval (1609417), Agustin Rios de Anda (6681395), Julie Bourgon (3093738), Takashi Kurogi (2570596), Daniel J. Mindiola (1321854) and Davy-Louis Versace (1593784)

Abstract

A quinoline-derived titanium complex (<b>TiQ</b>) 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 <b>TiQ</b>/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

Topics: Medicine, Physiology, Biotechnology, Evolutionary Biology, Developmental Biology, Space Science, Chemical Sciences not elsewhere classified, Information Systems not elsewhere classified, Ti-based NPs, free-radical photopolymerization, cationic photopolymerization, Ti-Based Nanoparticles, light irradiation, acrylate monomer, matrix, Iod, quinoline-derived titanium, Visible Light, laser flash photolysis, Cationic Photopolymerizations, iodonium salt, Ti-based nanoparticles, high-angle annular dark-field scanning transmission electron microscopy, transmission electron microscopy, TiQ, photosensitizing properties, Well-Defined Titanium Complex, photosynthesized Ti-based NPs, microstructural properties
Year: 2019
DOI identifier: 10.1021/acs.macromol.8b02719.s001
OAI identifier: oai:figshare.com:article/8097512
Provided by: FigShare
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