In-situ microfibrilization of liquid metal droplets in polymer matrix for enhancing electromagnetic interference shielding and thermal conductivity

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composites Science and Technology Pub Date : 2024-06-21 DOI:10.1016/j.compscitech.2024.110724

Ming-Lu Huang , Cheng-Long Luo , Chang Sun , Kun-Yan Zhao , Ming Wang

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Abstract

Herein, liquid metal microfibers (LMM) were constructed in poly (ε-caprolactone) (PCL) matrix and PCL/carbon nanotubes (CNT) composites via an in-situ microfibrilization of liquid metal (LM) droplets by a layer-by-layer stacking method. The aspect ratios of LMMs in the composites can be easily adjusted by controlling the number layers. The effect of LMM aspect ratios on electromagnetic interference (EMI) shielding effectiveness (SE) and thermal conductivity is discussed. The results show that the EMI SE value and the thermal conductivity increase with increasing aspect ratios of LMMs. In addition, the EMI shielding mechanism of PCL/LMM and PCL/LMM/CNT composites is evaluated comprehensively through the combination of electromagnetic simulation and experimental investigation. The efficiently conductive network can be formed in the composites with LMMs, which enhance EMI SE and thermal conductivity. Furthermore, the electric field distribution on the LMM surface is uneven, which enhances the polarization loss ability to electromagnetic waves.

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聚合物基质中液态金属液滴的原位微纤维化，用于增强电磁干扰屏蔽和导热性能

本文通过逐层堆叠法对液态金属（LM）液滴进行原位微纤维化，在聚（ε-己内酯）（PCL）基体和 PCL/碳纳米管（CNT）复合材料中构建了液态金属微纤维（LMM）。通过控制层数，可以轻松调整复合材料中 LMM 的长宽比。研究讨论了 LMM 长宽比对电磁干扰（EMI）屏蔽效果（SE）和热导率的影响。结果表明，EMI SE 值和热导率随着 LMM 长宽比的增加而增加。此外，还结合电磁模拟和实验研究，全面评估了 PCL/LMM 和 PCL/LMM/CNT 复合材料的 EMI 屏蔽机理。结果表明，PCL/LMM 和 PCL/LMM/CNT 复合材料能形成高效的导电网络，从而增强了 EMI SE 和导热性能。此外，LMM 表面的电场分布不均匀，增强了对电磁波的极化损耗能力。

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来源期刊

Composites Science and Technology 工程技术-材料科学：复合

CiteScore

16.20

自引率

9.90%

发文量

611

审稿时长

33 days

期刊介绍： Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites. Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.