Initiators Based on Benzaldoximes: Bimolecular and Covalently Bound Systems
| Autor: | Griesser, Markus, Rosspeintner, Arnulf, Dworak, Claudia, Höfer, Michael, Grabner, Gottfried, Liska, Robert, Gescheidt, Georg |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Macromolecules |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | Typical bimolecular photoinitiators (PIs) for radical polymerization of acrylates show only poor photoreactivity because of the undesired effect of back electron transfer. To overcome this limitation, PIs consisting of a benzaldoxime ester and various sensitizers based on aromatic ketones were introduced. The core of the photoinduced reactivity was established by laser flash photolysis, photo-CIDNP, and EPR experiments at short time scales. According to these results, the primarily formed iminyl radicals are not particularly active. The polymerization is predominantly initiated by C-centered radicals. Photo-DSC experiments show reactivities comparable to that of classical monomolecular type I PIs like Darocur 1173. |
| Databáze: | OpenAIRE |
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