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- W3089496908 abstract "Multifunctional polymeric photoinitiators with the ability of aza-Michael addition with acrylates, free radical polymerization of (meth)acrylates through type II photoinitiation and charge transfer complex (CTC) formation with iodonium salt (Iod) were prepared. They were synthesized via aza-Michael addition reaction between branched poly(ethylene imine) (PEI, Mn =1800 g/mol), 2-acryloyloxy thioxanthone and tetraethyl vinylidene bisphosphonate or diethyl vinylphosphonate. Their structures were confirmed by 1H NMR and FTIR spectroscopy. CTC formation between Iod (acceptor) and amines on PEI (donor) was confirmed by absorption shift to 440 nm in spectral analysis. Photopolymerization kinetics were monitored by real time FTIR upon visible light exposure using LED @405 nm, whereas Michael addition reactivities of the photoinitiators were monitored without irradiation. Excellent polymerization initiating performances were found and high final conversions were obtained. Results show that the CTCs formed at high concentrations of low-functionalized PEI allow polymerizations without light and increase polymerization efficiencies of Type II photoinitiation." @default.
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- W3089496908 date "2021-01-01" @default.
- W3089496908 modified "2023-09-30" @default.
- W3089496908 title "Photoinitiating systems based on poly(ethylene imine) for Michael addition and free radical photopolymerization" @default.
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- W3089496908 doi "https://doi.org/10.1016/j.jphotochem.2020.112959" @default.
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