One- and two-photon activity of cross-conjugated photoinitiators with bathochromic shift (pages 3280–3291)
Christian Heller, Niklas Pucher, Bernhard Seidl, Kadiriye Kalinyaprak-Icten, Gerald Ullrich, Ladislav Kuna, Valentin Satzinger, Volker Schmidt, Helga C. Lichtenegger, Jürgen Stampfl and Robert Liska
Version of Record online: 11 JUN 2007 | DOI: 10.1002/pola.22078
In these investigations we prepared and investigated several initiators for radical photopolymerization based on 1,5-diphenylpenta-1,4-diyn-3-one with different donor substituents. UV-Vis spectroscopy revealed a gradual red-shift of λmax and higher extinction in the order of the donor capability. The photoinitiator activity for classical single photon absorption was determined by photo-DSC experiments. Because of the D-π-A-π-D system of these compounds two-photon induced 3D photopolymerization experiments were performed. Some of the new initiators gave outstanding performance compared to often applied single photon initiators.