New one-component cationic photoinitiators for 3D printing applications
Authors:
- Joanna Ortyl,
- Filip Petko,
- Andrzej Świeży,
- Mariusz Galek,
- Bartosz Oksiuta,
- Dawid Oksiuta,
- Małgorzata Noworyta,
- Paweł Jamróz,
- Paweł Niezgoda,
- Weronika Wałczyk,
- Karolina Gałuszka,
- Katarzyna Starzak
Abstract
Cationic photopolymerization has recently attracted increasing interest, finding new uses in industries including microelectronics, dentistry, and 3D printing. New effective photoinitiators are needed as a result of these new uses. Diaryliodonium salts, which have significant solubility in monomers, good thermal stability, and low toxicity, are among the most potent cationic photoinitiators. However, the majority of the diaryliodonium photoinitiators that are commercially accessible have poor absorption qualities beyond 300 nm, rendering them inactive when exposed to standard Light Emitted Diodes (LED) light (especially maximum emission located at 365nm and 405nm). Replacing one of the aryl rings with a more effective chromophore, which dramatically increases absorption in the near-UV region, is an auspicious way to get around this problem. Using an LED emitting at 365 nm effectively photolyzes iodonium salt, producing superacid in the process. Superacid then triggers the polymerization of several monomers, including epoxides, vinyl ethers, oxetanes, and glycidyl ethers. Here, we introduce a collection of brand-new, one-component iodonium photoinitiators in which one of the aryl rings was swapped out for effective chromophores built on a benzylidene scaffold. These chromophores have a push-pull action that dramatically redshifts the absorption of their iodonium salts and makes them active under 365nm LED and, in some circumstances, 405nm LED irradiation. They also have an extended conjugated bond system (double bond) and a D-A structure. It was possible to generate new iodonium salts with various properties thanks to the use of an easily adaptable scaffold, opening up the opportunity of analyzing the impact of each modification. By creating novel iodonium salts with a variety of features using a readily adaptable scaffold, it was possible to study the effects of each modification on the photoinitiating capabilities of iodonium salts. The photochemical activity of the newly introduced iodonium photoinitiators was examined regarding the quantum efficiency of superacid production and the efficiency of photolysis (steady-state photolysis). The real-time FT-IR photopolymerization test was used to examine their photoinitiating capabilities. The most effective photoinitiators were employed in studies with epoxide and oxetane monomers for 3D printing.
- Record ID
- CUT9305277562164bc69412a422e4527b76
- Publication categories
- ; ;
- Author
- Pages
- 15
- Substantive notes
- Tyt. źródła wg okł.
- Data wyd. wg roku konf.
- Book
- 7th European Symposium of Photopolymer Science, September 19-22, 2022, Istanbul, Turkey : abstract book, 2022, [Istanbul], [Istanbul Technical University]
- Keywords in English
- photopolymerization, photoinitiators, 3D printing, cationic photopolymerization
- URL
- https://esps2022.org/abstracts/ Opening in a new tab
- Related project
- Molecular desing, synthesis and application of photoinitiator-catalysts (PICs) for photopolymerization reactions. . Project leader at PK: , ,
- Language
- eng (en) English
- License
- Score (nominal)
- 0
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT9305277562164bc69412a422e4527b76/
- URN
urn:pkr-prod:CUT9305277562164bc69412a422e4527b76
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.