Journal
ADVANCED MATERIALS
Volume 33, Issue 27, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202101298
Keywords
4D printing; Digital Light Processing; high stretchability; shape‐ memory polymers
Categories
Funding
- National Natural Science Foundation of China [12072142, 51903210]
- Science, Technology and Innovation Commission of Shenzhen Municipality [ZDSYS20200811143601004]
- Natural Science Basic Research Program of Shaanxi [2020JQ-174]
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A mechanically robust and UV-curable SMP system has been developed for 4D printing, allowing the fabrication of high-resolution, highly complex 3D structures with large shape change upon heating. The developed SMP system exhibits excellent fatigue resistance and can be repeatedly loaded more than 10,000 times, significantly improving the mechanical performance of SMP-based 4D printing structures for engineering applications such as aerospace, smart furniture, and soft robots.
4D printing is an emerging fabrication technology that enables 3D printed structures to change configuration over time in response to an environmental stimulus. Compared with other soft active materials used for 4D printing, shape-memory polymers (SMPs) have higher stiffness, and are compatible with various 3D printing technologies. Among them, ultraviolet (UV)-curable SMPs are compatible with Digital Light Processing (DLP)-based 3D printing to fabricate SMP-based structures with complex geometry and high-resolution. However, UV-curable SMPs have limitations in terms of mechanical performance, which significantly constrains their application ranges. Here, a mechanically robust and UV-curable SMP system is reported, which is highly deformable, fatigue resistant, and compatible with DLP-based 3D printing, to fabricate high-resolution (up to 2 mu m), highly complex 3D structures that exhibit large shape change (up to 1240%) upon heating. More importantly, the developed SMP system exhibits excellent fatigue resistance and can be repeatedly loaded more than 10 000 times. The development of the mechanically robust and UV-curable SMPs significantly improves the mechanical performance of the SMP-based 4D printing structures, which allows them to be applied to engineering applications such as aerospace, smart furniture, and soft robots.
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