The first panchromatic one-component BODIPY based iodonium salts exhibiting a absorption in the 400–600 nm spectral range for cationic photopolymerization for 3D printing
Authors:
- Monika Topa Skwarczyńska,
- Joanna Ortyl
Abstract
Photoinduced polymerisation of monomers is gaining popularity because it is an environmentally friendly and safe method for production of protective polymer coatings. Moreover, it has plenty of benefits. The basic advantage of the photopolymerization over other methods used for production of polymer coatings is its speed. These compositions are transformed from a liquid state into a fully cross-linked solid within seconds without emission of any volatile solvents to atmosphere. The photopolymerization has other advantages, e.g.: ambient temperature operation, solvent free formulations, and low energy consumption [1,2]. Currently available commercially and actually used in industry are photoinitiators based on iodonium salts, which exhibit absorption characteristics in the UV-C range, i.e. λmax = 220-280 nm. This makes them not suitable for initiating photopolymerisation processes in the visible range, which is a significant technological problem, because for the polymerisation process to occur efficiently, the absorption characteristics must be matched to the characteristics of the light emission Therefore, in this study, new iodonium salts based on the chromophore 4,4-difluoro-1,3,5,7,8-pentamethyl-4-bora-3a,4a-diaza-s-indecene (B-1) were presented for 3D printing applications. Iodonium salts with different anions such as tosylate, hexafluorophosphate, hexafluoroantimonate and triflate absorbing in the range up to 600 nm have been described. Real-time FT-IR and photo-DSC methods were used to confirm the suitability of the new BODIPY derivatives for initiating cationic photopolymerisation. The initiation efficiency of the one-component system was also compared with that of a two-component system consisting of a chromophore (the same as used to conduct iodonium salts) and the iodonium salt Speedcure 938. In addition, photochemical mechanisms were investigated through steady-state photolysis, ESR fluorescence experiments, theoretical calculations of molecular orbitals and electrochemical analysis. These studies determined the effect of the type of anion in the iodonium salt on the rate of proton generation in the acid. BODIPY derivatives are also efficient in initiating cationic and free radical polymerisation. Optical microscopy experiments have shown that different patterns can be obtained from experiments using specific resolution test targets and 3d-printing. Furthermore, photoinitiators based on chromophore B-1 can be used not only to initiate photopolymerisation processes, but also as colourimetric sensors to measure the degree of photopolymerisation.
- Record ID
- CUT8e970fdaf7594fc38f8b9c71bc4ff2a8
- Publication categories
- ; ;
- Author
- Pages
- 34
- Other elements of collation
- Bibliografia (na s.) - 34; Bibliografia (liczba pozycji) - 2
- 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
- BODIPY derivatives, iodonium salts, photopolymerization, cationic photopolymerization, 3D printing
- URL
- https://esps2022.org/abstracts/ Opening in a new tab
- Related project
- Synteza i badania właściwości aplikacyjnych nowych wysokowydajnych systemów fotoinicjujących dedykowanych do fotoutwardzalnych kompozytów stomatologicznych nowej generacji. . Project leader at PK: , ,
Projekty finansowane przez MNiSW - Language
- eng (en) English
- License
- Score (nominal)
- 0
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT8e970fdaf7594fc38f8b9c71bc4ff2a8/
- URN
urn:pkr-prod:CUT8e970fdaf7594fc38f8b9c71bc4ff2a8
* 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.