Initiators Based on Benzaldoximes: Bimolecular and Covalently Bound Systems.

ABSTRACT: 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.

SUBMITTER: Griesser M 

PROVIDER: S-EPMC3558022 | biostudies-literature | 2012 Nov

REPOSITORIES: biostudies-literature