Göschl, M., Taschner, R., Koch, T., Wolff, R., Liska, R., & Knaack, P. (2023). High-performance Sulfonium Borate Initiators for Hot Lithography. In RadTech Europe Conference and Exhibition 2023 : Abstract Book (pp. 32–32). http://hdl.handle.net/20.500.12708/192739
E163-02-1 - Forschungsgruppe Polymerchemie und Technologie E308-02-1 - Forschungsgruppe Strukturpolymere
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Published in:
RadTech Europe Conference and Exhibition 2023 : Abstract Book
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Date (published):
Oct-2023
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Event name:
RadTech Europe 2023 Conference & Exhibition
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Event date:
17-Oct-2023 - 18-Oct-2023
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Event place:
München, Germany
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Number of Pages:
1
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Keywords:
Photoacid generator; Cationic Photopolymerization; Hot Lithography
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Abstract:
Photoacid generators (PAGs) such as sulfonium hexafluorophosphates and perfluorinated tetraphenylborates are well established initiators in the field of cationic photopolymerization and already applied in a high-temperature 3D printing process called hot lithography. The new cyanide-ligated boron-based photoinitiator SBCN shows lower molecular weight compared to state-of-the-art borates and is less expensive to synthesize from commercial starting materials. With epoxy monomer BADGE, this new cationic photoinitiator outperforms commercial initiators in a broad range of temperatures. Formulations containing SBCN are thermally and storage stable and can be sensitized by anthracene derivatives. Hot lithography was carried out successfully at 90 °C and, compared to state-of-the-art sulfonium initiators, the printed parts exhibit excellent layer quality and low discoloration.
