Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 1, Pages 1994-2005Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c20659
Keywords
fused deposition modeling; dynamic covalent bond; isotropy; enhanced mechanical properties; polyurethane
Funding
- National Natural Science Foundation of China [51988102]
- National Key Research, and the Development Program of China [2017YFB0306903]
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By introducing a self-healing mechanism into the printing material, this study demonstrates an effective printing strategy to enhance interlayer adhesion in fused deposition modeling (FDM), improving the mechanical properties and isotropy of the printed products.
Additive manufacturing via fused deposition modeling (FDM) has become one of the most widely used technologies owing to its ease of operation and effective cost. However, the disappointing interlayer adhesion produced by FDM often results in inferior mechanical properties, which has become a technical bottleneck for industrial production. Herein, we demonstrate a facile and efficient printing strategy to enhance interlayer adhesion by introducing a self-healing mechanism into the printing material, thereby concurrently enhancing the mechanical properties and isotropy of the printed products. This strategy relies on the self-healing property of three-dimensional-printing materials. This self-healing property is endowed by introducing dynamic urea bonds on the thermoplastic polyurethane (TPU) molecular chains, and then, such dynamic bonds can be activated through thermal heating. Accordingly, the synthesized TPU reveals an efficient self-healing property and excellent printability owing to the existence of dynamic reversible covalent bonds. Moreover, objects with complex structures can be split and printed and then assembled using this strategy, avoiding the need for supporting structures and realizing the rapid prototyping of large-sized objects. The printing strategy proposed paves a candidate way to overcome the current challenges in obtaining high-quality products via FDM.
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