Journal article
Stiffness control in dual color tomographic volumetric 3D printing
Department of Mechanical Engineering, Technical University of Denmark1
Manufacturing Engineering, Department of Mechanical Engineering, Technical University of Denmark2
National Centre for Nano Fabrication and Characterization, Technical University of Denmark3
Nanofabrication, National Centre for Nano Fabrication and Characterization, Technical University of Denmark4
Polymer Microsystems, Nanofabrication, National Centre for Nano Fabrication and Characterization, Technical University of Denmark5
National Food Institute, Technical University of Denmark6
Research Group for Food Production Engineering, National Food Institute, Technical University of Denmark7
Department of Chemistry, Technical University of Denmark8
Center for Energy Resources Engineering, Centers, Technical University of Denmark9
Tomographic volumetric printing (TVP) physically reverses tomography to offer fast and auxiliary-free 3D printing. Here we show that wavelength-sensitive photoresins can be cured using visible (λ¯=455 nm) and UV (λ¯=365 nm) sources simultaneously in a TVP setup to generate internal mechanical property gradients with high precision.
We develop solutions of mixed acrylate and epoxy monomers and utilize the orthogonal chemistry between free radical and cationic polymerization to realize fully 3D stiffness control. The radial resolution of stiffness control is 300 µm or better and an average modulus gradient of 5 MPa/µm is achieved.
We further show that the reactive transport of radical inhibitors defines a workpiece’s shape and limits the achievable stiffness contrast to a range from 127 MPa to 201 MPa according to standard tensile tests after post-processing. Our result presents a strategy for controlling the stiffness of material spatially in light-based volumetric additive manufacturing.
| Language: | English |
|---|---|
| Publisher: | Nature Publishing Group UK |
| Year: | 2022 |
| Pages: | 367 |
| ISSN: | 20411723 |
| Types: | Journal article |
| DOI: | 10.1038/s41467-022-28013-4 |
| ORCIDs: | 0000-0003-0547-403X , Engay, Einstom , Moghaddam, Saeed Z. , Almdal, Kristoffer , Yang, Yi , Stubbe, Peter R. , Thormann, Esben and Islam, Aminul |
