Filip Petko, Magdalena Jankowska, Mariusz Galek, Małgorzata Noworyta, Roman Popielarz, Joanna Ortyl
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引用次数: 0
Abstract
New advanced iodonium salts based on stilbene chromophores with significantly improved photoinitiating properties are presented. The extended conjugated double bond system provides major improvement in quantum yield of superacid generation (up to 10 times higher compared to benzylidene-based iodonium salts) while maintaining absorption properties in UV-A and visible light. The newly developed iodonium salts exhibit photoinitiating activity toward cationically polymerizable monomers such as cyclic epoxy monomers (e.g., 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane-carboxylate (CADE)), oxetanes (e.g., bis[1-ethyl(3-oxetanyl)]methyl ether (OXT-221)) and glycidyl ether monomers (e.g., diglycidyl ether of bisphenol A (DGEBA)) under the irradiation by light-emitting diodes (LEDs) emitting at 365, 405 and even 430 nm, with no additives. Commonly used diaryliodonium photoinitiators are inactive under those irradiation wavelengths. Moreover, some of the new iodonium salts are also able to photoinitiate free radical photopolymerization of the acrylate monomers, such as trimethylolpropane triacrylate (TMPTA). Such high photoinitiating activity allows these salts to be used as one-component photoinitiators in cationic vat 3D printing of nanocomposites at ambient temperature. The resolution of the cationic prints was limited mainly by the DLP 3D printer and monomers, with slight signs of overpolymerization.
期刊介绍:
Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.