Cubane Cu 4 I 4 (phosphine) 4 Complexes as New Coinitiator for Free Radical Photopolymerization: Towards Aromatic Amine-Free Systems
Résumé
The investigation of copper-iodide cubane derivatives as new co-initiators for the free radical polymerization (FRP) of acrylate monomers under mild irradiation conditions is described for the first time here. These tetranuclear Cu(I)-based complexes have general formula Cu4I4(phosphine)4, where phosphine is triphenylphosphine (Cu1) or diphenylphosphine (Cu2). In the presence of commercial Type II photoinitiators such as isopropylthioxanthone (ITX) or camphorquinone (CQ), this class of co-initiators achieves high final conversions of the reactive functional groups. Comparison between the aromatic amine, such as ethyldimethylaminobenzoate (EDB) used as benchmark hydrogen donor, and these copper-based co-initiators are made, which demonstrates that the latter can be considered as a valid, environmental-friendly, alternative to toxic aromatic amines. Markedly, photoluminescent materials can be generated thanks to the presence of cubanes linked to the polymer network.
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