Rapid Additive Manufacturing of 3D Geometric Structures via Dual-Wavelength Polymerization

Li, F., Thickett, S.C., Maya, F., Doeven, Egan, Guijt, Rosanne and Breadmore, M.C. 2020, Rapid Additive Manufacturing of 3D Geometric Structures via Dual-Wavelength Polymerization, ACS Macro Letters, vol. 9, pp. 1409-1414, doi: 10.1021/acsmacrolett.0c00465.

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Title Rapid Additive Manufacturing of 3D Geometric Structures via Dual-Wavelength Polymerization
Author(s) Li, F.
Thickett, S.C.
Maya, F.
Doeven, EganORCID iD for Doeven, Egan orcid.org/0000-0003-2677-4269
Guijt, RosanneORCID iD for Guijt, Rosanne orcid.org/0000-0003-0011-5708
Breadmore, M.C.
Journal name ACS Macro Letters
Volume number 9
Start page 1409
End page 1414
Total pages 6
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2020
ISSN 2161-1653
Summary A dual-wavelength photopolymerization process is presented, allowing for the volumetric fabrication of complex geometries using a multistep process. The methacrylate-based resin contained 0.1 wt % camphorquinone/0.1 wt % ethyl 4-(dimethylamino) benzoate and 0.2 wt % bis[2-(ochlorophenyl)-4,5-diphenylimidazole] as photoinitiator (473 nm) and photoinhibitor (365 nm), respectively. The photoinitiator and photoinhibitor concentrations were optimized to allow for photocuring to full depth (4.6 mm) following an exposure time of 2 min solely by 473 nm light, but no curing occurred when 365 nm light was present due to photoinhibition. This resin was validated using one-step volumetric fabrication of two objects containing voids defined by the 365 nm irradiation region. Two more complex structures were printed in a step-by-step manner, relying on the dynamic control of the projection patterns of both 365 and 473 nm projectors, decreasing the print time from 20 min using a commercially available single wavelength resin printer to 2 min.
Language eng
DOI 10.1021/acsmacrolett.0c00465
Indigenous content off
Field of Research 0303 Macromolecular and Materials Chemistry
0306 Physical Chemistry (incl. Structural)
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30144314

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