Robust Bicontinuous Elastomer–Metal Foam Composites with Highly Tunable Stiffness
Robust Bicontinuous Elastomer–Metal Foam Composites with Highly Tunable Stiffness
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坚固的双连续弹性体 - 具有高度可调刚度的金属泡沫复合材料
DOI：
10.1002/adem.202101533
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发表时间：
2022
影响因子：
3.6
通讯作者：
Shan, Wanliang
中科院分区：
文献类型：
--
作者：
Sharifi, Siavash;Mohammadi Nasab, Amir;Chen, Pei-En;Liao, Yiliang;Jiao, Yang;Shan, Wanliang
本文提出了一类具有高度可调机械刚度的新型双连续弹性体-金属泡沫复合材料，并对其进行了制备、表征和演示。这种智能复合材料是两种泡沫的双连续网络，一种是由低熔点合金（LMPA）制成的金属，另一种是由聚二甲基硅氧烷（PDMS）制成的弹性体。复合材料的刚度可以通过诱导其LMPA组分的相变来调节。在LMPA熔点以下，智能复合材料的杨氏模量≈1 GPa，而在LMPA熔点以上，杨氏模量≈1 MPa。因此，通过本文提出的双连续泡沫复合材料结构，可以实现≈1000x的急剧刚度变化，高于所有现有的鲁棒智能复合材料。利用有效介质理论对双连续智能复合材料的杨氏模量进行了预测，与实验测量的杨氏模量有较好的一致性。最后，还演示了这些智能材料作为机械臂智能关节的使用。
Herein, a new class of robust bicontinuous elastomer–metal foam composites with highly tunable mechanical stiffness is proposed, fabricated, characterized, and demonstrated. The smart composite is a bicontinuous network of two foams, one metallic made of a low melting point alloy (LMPA) and the other elastomeric made of polydimethylsiloxane (PDMS). The stiffness of the composite can be tuned by inducing phase changes in its LMPA component. Below the melting point of the LMPA, Young's modulus of the smart composites is ≈1 GPa, whereas above the melting point of the LMPA it is ≈1 MPa. Thus, a sharp stiffness change of ≈1000× can be realized through the proposed bicontinuous foam composite structure, which is higher than all available robust smart composites. Effective medium theory is also used to predict the Young's modulus of the bicontinuous smart composites, which generates reasonable agreement with experimentally measured Young's modulus of the smart composites. Finally, the use of these smart materials as a smart joint in a robotic arm is also demonstrated.