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Talks and Poster Presentations (with Proceedings-Entry):

R. Liska:
"Advanced photoinitiators for coatings, biomaterials and 3D printing";
Talk: 5th European Symposium of Photopolymer Science, Mulhouse, France (invited); 09-03-2018 - 09-06-2018; in: "5th European Symposium of Photopolymer Science", 5th European Symposium of Photopolymer Science, (2018), 9.



English abstract:
During the last decades significant progress can be found for efficient photoinitiators under visible light irradiation. While acyl germanium-based initiators have already found their way on the market under the tradename Ivocerin®, researchers still aim for cleavable initiators for longer wavelength. Recently we have developed a new generation of tetra acyl tin compounds [1] that show surprisingly low toxicity, high reactivity, good photobleaching behavior and high activity, even at wavelength well above 530 nm.
One disadvantage of commonly used photoinitiators is their aromatic moiety that not only leads to unwanted benzaldehyde formation and other potentially hazardous compounds. We have found that a series of purely aliphatic compounds that are also known from the human metabolism show surprisingly high reactivity. These cheap molecules are able to outperform at least all classical bimolecular Type II initiators.
Cationic Photopolymerization also suffers from potentially toxic initiators, frequently based on heavy metals like antimony. Recently we have developed a highly reactive aluminum-based initiator that outperforms most initiator in the case of BADGE-based resins. We were able to show that this photoinitiator is also highly active in frontal polymerization and allows the curing of thin films down to 0.7mm. Furthermore carbon-fibre composites can be cured effectively.
Multiphoton Polymerization is a high resolution technique to write arbitrary 3D structures in the µm range. This technique is especially promising in the field of tissue regeneration. With this technique in vivo writing in the presence of cells is possible. Currently used multiphoton initiators are of bimolecular type, which unfortunately forms singlet oxygen and a lot of reactive oxygen species that are responsible for cell death. Herein we present that first efficient cleavable multiphoton initiator where cells show an excellent survival rate.

Keywords:
efficient photoinitiators, a new generation of tetra acyl tin compounds, low toxicity, high reactivity

Created from the Publication Database of the Vienna University of Technology.