期刊
ACS MACRO LETTERS
卷 10, 期 4, 页码 486-491出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.1c00121
关键词
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资金
- Department of Energy's National Nuclear Security Agency [N000263171]
- Army Research Laboratory [W911NF-18-2-0035]
- Consejo Nacional de Ciencia y Tecnologia (CONACYT, Mexican Council of Science and Technology)
This study demonstrates that the concentration of dynamic covalent cross-links plays a crucial role in balancing the self-healing ability and shape stability of 3D printable resins. With a dynamic covalent cross-link concentration of 1.8 mol %, 99% self-healing efficiency can be achieved without compromising the shape stability of the printed objects.
Dynamic covalent bonds impart new properties to 3D printable materials that help to establish 3D printing as an accessible and efficient manufacturing technique. Here, we studied the effect of a thermally reversible Diels-Alder cross-linker on the shape stability of photoprintable resins and their self-healing properties. Resins containing different concentrations of dynamic covalent cross-links in a polyacrylate network showed that the content of dynamic cross-links plays a key role in balancing shape stability with self-healing ability. The shape stability of the printed objects was evaluated by measuring the dimensional changes after thermal treatment. The self-healing efficiency of the 3D printed resins was characterized with a scratch test and tensile testing. A dynamic covalent cross-link concentration of 1.8 mol % was enough to provide 99% self-healing efficiency without disrupting the shape stability of the printed objects. Our work shows the potential of dynamic covalent bonds in broadening the availability of 3D printable materials that are compatible with vat photopolymerization.
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