4D Printing of Recyclable Lightweight Architectures Using High Recovery Stress Shape Memory Polymer
4D Printing of Recyclable Lightweight Architectures Using High Recovery Stress Shape Memory Polymer
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DOI：
10.1038/s41598-019-44110-9
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发表时间：
2019-05-20
影响因子：
4.6
通讯作者：
Li, Guoqiang
中科院分区：
文献类型：
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作者：
Li, Ang;Challapalli, Adithya;Li, Guoqiang
高性能轻质结构，例如具有优异机械性能的金属微晶格，已经被3D打印出来，但它们不具有形状记忆效应（SME），限制了它们在先进工程结构中的应用，例如作为多功能轻质夹层结构的核心。可 3D 打印的自修复形状记忆聚合物 (SMP) 微晶格可能是一种解决方案。然而，现有的 3D 打印热固性 SMP 存在强度低、应力记忆差或不可回收性等问题。为了解决这个问题，本研究开发了一种新型热固性聚合物，它集高强度、高恢复应力、完美的形状恢复、良好的可回收性和使用直接光打印的3D打印性能于一体。打印并测试了具有各种晶胞和长度尺度的轻质微晶格。结果表明，立方微晶格具有与金属微晶格相当甚至更高的机械强度、良好的SME、良好的恢复应力和可回收性，使其成为第一个用于潜在多功能轻质承载结构应用的多功能轻质结构（MLA）。
High-performance lightweight architectures, such as metallic microlattices with excellent mechanical properties have been 3D printed, but they do not possess shape memory effect (SME), limiting their usages for advanced engineering structures, such as serving as a core in multifunctional lightweight sandwich structures. 3D printable self-healing shape memory polymer (SMP) microlattices could be a solution. However, existing 3D printable thermoset SMPs are limited to either low strength, poor stress memory, or non-recyclability. To address this issue, a new thermoset polymer, integrated with high strength, high recovery stress, perfect shape recovery, good recyclability, and 3D printability using direct light printing, has been developed in this study. Lightweight microlattices with various unit cells and length scales were printed and tested. The results show that the cubic microlattice has mechanical strength comparable to or even greater than that of metallic microlattices, good SME, decent recovery stress, and recyclability, making it the first multifunctional lightweight architecture (MLA) for potential multifunctional lightweight load carrying structural applications.