Abstract
Light-activated shape-memory materials can return to the originally printed or manufactured shape in temperatures higher than their glass transition temperatures. This effect is widely applicable in the field of biomedicine, biology and others. In this research we are focusing on new materials for light-activated 4D printing—the focus is placed on biocompatible CuS nanoparticle /polyurethane composite for light conversion to heat that can be used as a filament for 3D printing. The synthesis of the composite and nanoparticles, as well as the physical properties of the material are described, and the shape-memory effect is tested for different concentrations of the nanoparticle filler. The best results were found to be for 0.5% CuS/PU composite that reached the unfolding time of 63 s under Xe lamp irradiation.
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Acknowledgements
This research was conducted as a part of project “Light activated 4D printed materials” of the Baltic-German University Liaison Office is supported by the German Academic Exchange Service (DAAD) with funds from the Foreign Office of the Federal Republic Germany. We are thankful to Latvian State Institute of Wood Chemistry, where the DSC measurements were made by Dr. Chem Dzintra Vilsone. Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union's Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART2.
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Vitola, V., Bite, I., Apsite, I. et al. CuS/polyurethane composite appropriate for 4D printing. J Polym Res 28, 13 (2021). https://doi.org/10.1007/s10965-020-02375-z
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DOI: https://doi.org/10.1007/s10965-020-02375-z