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.

Item Type:	Refereed Article
Keywords:	analytical chemistry
Research Division:	Engineering
Research Group:	Materials engineering
Research Field:	Polymers and plastics
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the chemical sciences
UTAS Author:	Li, F (Mr Feng Li)
UTAS Author:	Thickett, SC (Associate Professor Stuart Thickett)
UTAS Author:	Maya, F (Mr Fernando Maya Alejandro)
UTAS Author:	Guijt, RM (Dr Rosanne Guijt)
UTAS Author:	Breadmore, MC (Professor Michael Breadmore)
ID Code:	143974
Year Published:	2020
Funding Support:	Australian Research Council (LP160101247)
Web of Science® Times Cited:	8
Deposited By:	Chemistry
Deposited On:	2021-04-13
Last Modified:	2022-01-06
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