16 September 2016 Design, synthesis, and characterization of photoinitiators for two-photon polymerization
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Abstract
A series of dipolar and quadrupolar two-photon absorption (2PA) photoinitiators (PIs) based around the well-known triphenylamine (TPA) core and tricyanofuran (TCF) acceptors have been prepared for use in two-photon polymerisation (TPP). The synthesised dipolar species are designated as 5 and 7, and the remaining quadrupolar species are 6, 8, 9 and 10. Large two-photon absorption cross-sections (δ2PA) ranging between 333 - 507 GM were measured at 780 nm using the z-scan technique. Fluorescence quantum yields (ΦF) were below 3% across the series when compared to Rhodamine 6G as a reference standard. Finally, TPP tests were conducted on PIs 7 and 8 to assess their ability to initiate the polymerisation of acrylate monomers using an 800 nm femtosecond Ti:Sapphire laser system.
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Reece Whitby, Reece Whitby, Ryan MacMillan, Ryan MacMillan, Stefaan Janssens, Stefaan Janssens, Sebastiampillai Raymond, Sebastiampillai Raymond, Dave Clarke, Dave Clarke, Andrew Kay, Andrew Kay, Jianyong Jin, Jianyong Jin, Cather M. Simpson, Cather M. Simpson, } "Design, synthesis, and characterization of photoinitiators for two-photon polymerization", Proc. SPIE 9920, Active Photonic Materials VIII, 992026 (16 September 2016); doi: 10.1117/12.2235832; https://doi.org/10.1117/12.2235832
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