Exploring Aromatic IS/I-Thioformates as Photoinitiators

Thiyl radicals were generated from aromatic S-thioformates by photolysis. The corresponding photo-initiated decarbonylation allows initiating polymerization reactions in both acrylate- and thiol-acrylate-based resin systems. Compared to aromatic thiols, the introduction of the photolabile formyl gro...

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Bibliographic Details
Published in:Polymers 2023-03, Vol.15 (7)
Main Authors: Rieger, Paul, Pueschmann, Sabrina, Haas, Michael, Schmallegger, Max, Guedes de la Cruz, Gema, Griesser, Thomas
Format: Article
Language:English
Subjects:
Carbamates
Polymerization
Thiols
Online Access:Get full text
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Summary:Thiyl radicals were generated from aromatic S-thioformates by photolysis. The corresponding photo-initiated decarbonylation allows initiating polymerization reactions in both acrylate- and thiol-acrylate-based resin systems. Compared to aromatic thiols, the introduction of the photolabile formyl group prevents undesired reactions with acrylate monomers allowing photoinitiators (PIs) with constant reactivity over storage. To demonstrate the potential of S-thioformates as PIs, the bifunctional molecule S,S′-(thiobis(4,1-phenylene))dimethanethioate (2b) was synthesized, providing reactivity under visible light excitation. Consequently, acrylate-based formulations could successfully be processed by digital light processing (DLP)-based stereolithography at 405 nm in high resolution.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym15071647