SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 6: Poster

KFM 6.43: Poster

Dienstag, 28. März 2023, 17:00–19:00, P3

UV-triggered polymerisation of photosensitive resins via harmonic emission of Bariumtitanate nanocrystals — •Eugen Wolf and Mirco Imlau — Institute of Physics, Barbarastr. 7, Osnabrueck University

Ultraviolet-photosensitive resins are important in various industrial applications like laser-based 3D printing or fibre-reinforced polymers. Spatially localized polymerization becomes possible using laser light at photon energies that are adjusted to the absorption features of the corresponding photoinitiator. A drawback of this approach, however, is the transmission loss of the incident UV light, so that it can be applied only for polymerization of surfaces or thin volumes. To overcome this limitation, the use of infrared light in combination with nanoscaled photocatalytic containers in the resin has been proposed. In this contribution, we present an alternative approach based on the use of harmonic nanocrystals, i.e. to convert the incident infrared to the UV region deep inside the resin. For this purpose, commercially available Bariumtitanate nanocrystals and a regneratively amplified fs-laser system are used. Remarkably, a high reproducibility of the polymerization process as a function of the light propagation coordinate is uncovered. Furthermore, our setup allows for the inspection of the dynamics and shape of the liquid-solid phase front for different laser parameters. We discuss our results taking a simplified model for nonlinear optical emission of nanoparticles stochastically distributed in the resin into account.