A New Phosphine for Efficient Free Radical Polymerization under Air.

Authors :: Kirschner J
Becht JM
Klee JE
Lalevée J
Source :: Macromolecular rapid communications [Macromol Rapid Commun] 2020 May; Vol. 41 (9), pp. e2000053. Date of Electronic Publication: 2020 Mar 20.
Publication Year :: 2020
Abstract: A new phosphine is proposed as efficient coinitiator for camphorquinone (CQ)-based photoinitiating systems for the free radical polymerization of (meth)acrylates. Remarkably, this new co-initiator can exhibit two functionalities: a phosphine moiety to overcome oxygen inhibition and an iodonium salt moiety as counter cation to initiate the polymerization process. Excellent polymerization performances in the presence of CQ for the free radical polymerization of methacrylates under blue light are observed, and amine-free systems can be easily developed from the proposed structure. The photopolymerization of composites is also investigated in the presence of the new phosphine (without iodonium counter cation) and very interesting depth of cure can be obtained from the new developed photoinitiating system after only 20 s of irradiation with a blue light-emitting diode.<br /> (© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)