Analytische Chemie
Filtern
Dokumenttyp
- Zeitschriftenartikel (38)
- Vortrag (12)
- Beitrag zu einem Tagungsband (1)
Sprache
- Englisch (51) (entfernen)
Schlagworte
- Photophysics (51) (entfernen)
Organisationseinheit der BAM
Eingeladener Vortrag
- nein (12)
Photo-initiated cross-linking of multifunctional acrylic esters in polymeric binders was investigated based on digital imaging using the Computer-to-Plate (CtP) technology applying laser exposure in the near-infrared (NIR). Generation of initiating radicals occurs by electron transfer from the excited state of the NIR-sensitizer to the radical generator, an onium salt. Iodonium salts derived from several borates and those with the bis(trifluoromethylsulfonyl)imide anion resulted in lithographic materials with high sensitivity. Photo-induced electron transfer plays a major function to generate initiating radicals by a sensitized mechanism but thermal events also influence sensitivity of the coating. Internal conversion was the major deactivation pathway while a certain fraction of NIR-dye fluorescence was also available. A line shape focused laser system with emission in the NIR was successfully used to bake the materials.