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One‐ and two‐photon activity of cross‐conjugated photoinitiators with bathochromic shift |
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| Authors: | Christian Heller Niklas Pucher Bernhard Seidl Kadiriye Kalinyaprak‐Icten Gerald Ullrich Ladislav Kuna Valentin Satzinger Volker Schmidt Helga C Lichtenegger Jürgen Stampfl Robert Liska |
| Institution: | 1. Division of Macromolecular Chemistry, Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163/MC, 1060 Vienna, Austria;2. Joanneum Research, Institute of Nanostructured Materials and Photonics, Franz Pichlerstr. 30, 8160 Weiz, Austria;3. Institute of Materials Science and Technology, Vienna University of Technology, Favoritenstraβe 9‐11,1040 Vienna, Austria;4. Division of Macromolecular Chemistry, Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163/MC, 1060 Vienna, AustriaDivision of Macromolecular Chemistry, Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9/163/MC, 1060 Vienna, Austria |
| Abstract: | Intrigued by the good performance of 1,5‐diphenylpenta‐1,4‐diyn‐3‐one ( DPD ) as photoinitiator for radical polymerization we prepared and investigated several donor substituted derivatives. UV‐Vis spectroscopy revealed a gradual red‐shift of λmax and higher extinction in the order of the donor capability. A methoxy‐substituted derivative ( O‐DPD ) exhibited significant photoinitiation activity in photo‐DSC experiments. Steady state photolysis experiments showed decreased decomposition rates with increasing donor capability. A dimethylamino derivative N‐DPD was even photostable under these conditions. Because of to the D‐π‐A‐π‐D system of these compounds two‐photon induced 3D photopolymerization experiments were performed and N‐DPD showed outstanding performance compared to often applied single photon initiators. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 3280–3291, 2007 |
| Keywords: | differential scanning calorimetry(photo‐DSC) photoinitiators photopolymerization radical polymerization two photon induced photopolymerization UV‐vis spectroscopy |