Highly Stretchable Polymer Composite with Strain‐Enhanced Electromagnetic Interference Shielding Effectiveness
Highly Stretchable Polymer Composite with Strain‐Enhanced Electromagnetic Interference Shielding Effectiveness
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DOI：
10.1002/adma.201907499
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发表时间：
2020-02
影响因子：
29.4
通讯作者：
Bin Yao;Wei Hong;Tianwu Chen;Zhubing Han;Xinwei Xu;R. Hu;Jianyu Hao;Changhao Li;He Li
中科院分区：
文献类型：
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作者：
Bin Yao;Wei Hong;Tianwu Chen;Zhubing Han;Xinwei Xu;R. Hu;Jianyu Hao;Changhao Li;He Li
含有导电填料的聚合物复合材料已被开发为机械柔性、易于加工的电磁干扰 (EMI) 屏蔽材料。尽管有一些含有纳米结构银和碳纳米管的弹性体复合材料表现出适度的拉伸性，但它们的 EMI 屏蔽效能 (SE) 会随着拉伸而不断恶化。据报道，一种嵌入三维 (3D) 液态金属 (LM) 网络的高度可拉伸聚合物复合材料在拉伸时表现出 EMI SE 大幅增加，其在 2.65-40 GHz 的超宽频率范围内与金属板的 EMI SE 相匹配。 3D LM 复合材料在大机械变形下实现的电导率在可拉伸导体中属于最先进的水平。该材料具有皮肤般的弹性柔顺性和韧性，为满足新兴软性和人性化电子产品的需求提供了一条途径。
Polymer composites with electrically conductive fillers have been developed as mechanically flexible, easily processable electromagnetic interference (EMI) shielding materials. Although there are a few elastomeric composites with nanostructured silvers and carbon nanotubes showing moderate stretchability, their EMI shielding effectiveness (SE) deteriorates consistently with stretching. Here, a highly stretchable polymer composite embedded with a three‐dimensional (3D) liquid‐metal (LM) network exhibiting substantial increases of EMI SE when stretched is reported, which matches the EMI SE of metallic plates over an exceptionally broad frequency range of 2.65–40 GHz. The electrical conductivities achieved in the 3D LM composite are among the state‐of‐the‐art in stretchable conductors under large mechanical deformations. With skin‐like elastic compliance and toughness, the material provides a route to meet the demands for emerging soft and human‐friendly electronics.