Novel Copper Complexes as Visible Light Photoinitiators for the Synthesis of Interpenetrating Polymer Networks (IPNs)

This work is devoted to the study of two copper complexes (Cu) bearing pyridine ligands, which were synthesized, evaluated and tested as new visible light photoinitiators for the free radical photopolymerization (FRP) of acrylates functional groups in thick and thin samples upon light-emitting diode...

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Bibliographic Details
Published in:Polymers 2022-05, Vol.14 (10), p.1998
Main Authors: Rahal, Mahmoud, Noirbent, Guillaume, Graff, Bernadette, Toufaily, Joumana, Hamieh, Tayssir, Gigmes, Didier, Dumur, Frédéric, Lalevée, Jacques
Format: Article
Language:English
Subjects:
Acrylates
Chemical Sciences
Chemical synthesis
Composition
Coordination compounds
Copper
Copper compounds
Ethanol
Fourier transforms
Free radicals
Functional groups
Glass fiber reinforced plastics
Infrared spectroscopy
Interpenetrating networks
Ligands
Light emitting diodes
Material chemistry
Methods
Optical properties
Organometallic compounds
Photoinitiators
Photolysis
Photopolymerization
Polymerization
Polymers
Potassium
Pyridine
Semiconductor lasers
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Summary:This work is devoted to the study of two copper complexes (Cu) bearing pyridine ligands, which were synthesized, evaluated and tested as new visible light photoinitiators for the free radical photopolymerization (FRP) of acrylates functional groups in thick and thin samples upon light-emitting diodes (LED) at 405 and 455 nm irradiation. These latter wavelengths are considered to be safe to produce polymer materials. The photoinitiation abilities of these organometallic compounds were evaluated in combination with an iodonium (Iod) salt and/or amine (e.g., -phenylglycine-NPG). Interestingly, high final conversions and high polymerization rates were obtained for both compounds using two and three-component photoinitiating systems (Cu1 (or Cu2)/Iodonium salt (Iod) (0.1%/1% / ) and Cu1 (or Cu2)/Iod/amine (0.1%/1%/1% / / )). The new proposed copper complexes were also used for direct laser write experiments involving a laser diode at 405 nm, and for the photocomposite synthesis with glass fibers using a UV-conveyor at 395 nm. To explain the obtained polymerization results, different methods and characterization techniques were used: steady-state photolysis, real-time Fourier transform infrared spectroscopy (RT-FTIR), emission spectroscopy and cyclic voltammetry.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14101998