具有自修复能力的高拉伸液态金属/聚（聚氨酯-尿素）复合材料，用于电磁干扰屏蔽

IF 14.2 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-07-11 DOI:10.1016/j.compositesb.2025.112808

Rui-Yu Ma , Shuang-Qin Yi , Zhi-Xing Wang , Yong-fan Lin , Run-Pan Nie , Ding-Xiang Yan , Li-Chuan Jia

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引用次数: 0

摘要

下一代柔性电子器件对具有自愈能力的可拉伸电磁干扰屏蔽材料的使用可靠性提出了更高的要求。然而，生产具有室温自愈能力的高拉伸EMI屏蔽材料仍然具有挑战性。本文首先通过设计二硫键和铵盐键合成室温自愈型聚氨酯-尿素（PUU），然后以软液态金属（LM）作为导电填料制备具有室温自愈能力的高拉伸LM/PUU复合材料。40 vol% LM的LM/PUU复合材料在0.3 mm的微小厚度下具有34.1 dB的高EMI屏蔽效能（EMI SE），即使在100%应变下，EMI SE也略微增加到36.3 dB，显示出优异的拉伸稳定性。在室温下处理10 min后，LM/PUU复合材料的自愈率高达94.2%，具有良好的导热性和焦耳加热性能。本研究提出了一种开发具有自修复能力的高拉伸电磁干扰屏蔽材料的新方法，用于柔性和耐用电子设备领域的高级电磁干扰屏蔽应用。

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Highly stretchable liquid metal/poly(urethane-urea) composite with self-healing ability for electromagnetic interference shielding

Stretchable electromagnetic interference (EMI) shielding materials with self-healing ability are in high demand to guarantee the service reliability in the next-generation flexible electronic devices. However, it still remains challenging to yield highly stretchable EMI shielding materials with self-healing ability at room temperature. Herein, room-temperature self-healing poly(urethane-urea) (PUU) is first synthesized by designing disulfide and ammonium ester bonds, and then soft liquid metal (LM) is used as a conductive filler to yield highly stretchable LM/PUU composites with room-temperature self-healing ability. The LM/PUU composite with 40 vol% LM exhibits a high EMI shielding effectiveness (EMI SE) of 34.1 dB at a tiny thickness of 0.3 mm, and the EMI SE increases slightly to 36.3 dB even at 100 % strain, indicating excellent stretching stability. The self-healing efficiency is as high as 94.2 % for the LM/PUU composites after being treated at room temperature for 10 min. It is also demonstrated that the LM/PUU composites possess good thermal conductivity and Joule heating performance. This study proposes a new approach to developing highly stretchable EMI shielding materials with self-healing ability for advanced EMI shielding applications in the area of flexible and durable electronic devices.

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.