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Rapid additive manufacturing of 3D geometric structures via dual-wavelength polymerization
journal contribution
posted on 2023-05-20, 22:50 authored by Li, F, Stuart ThickettStuart Thickett, Fernando Maya AlejandroFernando Maya Alejandro, Doeven, EH, Rosanne Guijt, Michael BreadmoreMichael BreadmoreA 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.
Funding
Australian Research Council
Young Optics Inc
History
Publication title
ACS Macro LettersVolume
9Issue
10Pagination
1409-1414ISSN
2161-1653Department/School
School of Natural SciencesPublisher
American Chemical SocietyPlace of publication
United StatesRights statement
Copyright 2020 American Chemical SocietyRepository Status
- Restricted