Lawrence Livermore国家实验室（LLNL）已发表了针对4D印刷有机硅的研究。LLNL将其直接墨水写作方法与形状内存聚合物结合在一起，以创建可以从压缩期恢复的硅酮结构。
The shape changing silicone structures could have a broad range of applications, especially in the medical industry. ETH Zurich researchers recently created asilicone artificial heart with 3D printing和by adding shape memory polymers LLNL could perhaps extend the life of the structure.
llnl设想其4D印刷的硅酮结构可以在“wearable protective padding”将在特定温度条件下激活。
Direct ink writing (DIW)
虽然有机硅是3D打印的特别理想的材料，但与使用3D结构也很难。其他研究人员也有utlized water to create 3D printed silicone, but LLNL opted for its direct ink writing technology.
劳伦斯·利弗莫尔（Lawrence Livermore）在许多最近的项目中实施了直接的墨水写作技术。这包括最新breakthrough into 3D printed glass以及修改的方法create aerospace grade carbon fiber composites.
该方法涉及使用具有粘度和弹性的材料的粘弹性油墨。在该项目中，LLNL将硅胶与形状聚合物壳相结合。
Shape memory
正如论文所解释的那样，使用形状内存聚合物将另一层功能添加到3D打印零件中。该方法被广泛称为4D打印，许多组证明了该技术的有用性 - 例如4D打印出高级乳房植入物的中国外科医生. However the paper explains how its silicone approach is novel,
在这里，我们首次证明，仅通过添加具有控制的壳玻璃玻璃过渡温度的聚合物微球，就可以在3D打印的多孔弹性体中实现形状记忆。
The team tested the shape memory by compressing the structures before thermal soaking and successfully restored the object’s shape. As a result, the researchers explain its future work will“包括多物质印刷和在线混合，以进一步调整结构，孔隙率和材料特性。”
The research paper, titled ‘3D Printed Silicones with Shape Memory’ has been出版于科学报告.
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Featured image shows Figure 1d-g from the paper shows the printing process and microscopic images of the printed structures. Image via Scientific Reports.
