Abstract
Single- and two-photon holographic recordings were performed in a photopolymer material consisting of two types of monomers: an acrylamide (1,4-bis(acryloyl)piperazine) and an epoxide ((bis(4-oxiran-2-ylmethoxy)phenyl) sulfide). Thus, cationic ring-opening polymerization and free-radical polymerization of the monomers were simultaneously initiated. The arylsulfonium salt (2-(N,N,N-triethylammonium)methyl-9-oxo-10-(4-heptyloxyphenyl)-9H-thioxanthenium dihexafluorophosphate) was chosen as the photoinitiator. Effective photopolymerization conditions were found for both (single- and two-photon) photoinitiation modes depending on the recording light intensity. The concentrations of the components (monomers and photoinitiator) in the photopolymer was optimized, and a refractive index change of as much as 0.0015 was achieved.
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Acknowledgements
Authors would like to acknowledge the Multi-Access Chemical Research Center SB RAS for spectral and analytical measurements.
Funding
This research was partially funded by the Ministry of Education and Science of the Russian Federation (the project number is № AAAA-A17-117053110007-0).
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Vasilyev, E.V., Shelkovnikov, V.V., Orlova, N.A. et al. Single- and two-photon recording of holograms at combined cationic and free-radical polymerization photoinitiated by thioxanthenone derivatives. Polym J 52, 1279–1287 (2020). https://doi.org/10.1038/s41428-020-0381-2
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DOI: https://doi.org/10.1038/s41428-020-0381-2
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