Facile transformation of graphite composites into their porous analogues with superior electrical, thermal, and EMI shielding properties

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-07-18 DOI:10.1016/j.compositesb.2025.112827

Tomas Plachy, Erika Pavlikova, Robert Moucka, Martin Cvek

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引用次数: 0

Abstract

Novel porous conducting polymer composites were prepared through the direct expansion of expandable graphite within a melted polypropylene matrix. A facile in-situ method resulted in a remarkable reduction in the electrical percolation threshold of composites containing expanded graphite, forming an accordion-like network inside the polymer matrix compared to their non-expanded compact analogues. Despite their porosity, the expanded samples showed increased thermal conductivity, and the variation of electrical and thermal conductivity with the filler concentration adhered to the percolation theory and Lichtenecker model, respectively. Depending on the concentration, the expansion process notably enhanced the electromagnetic interference (EMI) shielding efficiency, producing a composite with shielding performance above 20 dB. The presented strategy enables a facile and cost-effective improvement of the electrical, thermal, and EMI shielding properties without affecting the weight of the composite, making it highly relevant for industrial adoption.

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将石墨复合材料转化为具有优异电、热和电磁干扰屏蔽性能的多孔类似物

采用可膨胀石墨在熔融聚丙烯基体中直接膨胀的方法制备了新型多孔导电聚合物复合材料。一种简单的原位方法显著降低了含有膨胀石墨的复合材料的电渗透阈值，与未膨胀的致密类似物相比，在聚合物基体内形成了一个手风琴状的网络。膨胀后的试样虽然孔隙率较高，但导热系数增大，电导率和导热系数随填料浓度的变化分别符合渗流理论和Lichtenecker模型。在不同浓度下，膨胀过程显著提高了电磁干扰（EMI）屏蔽效率，制备出屏蔽性能在20 dB以上的复合材料。所提出的策略可以在不影响复合材料重量的情况下，方便且经济地改善电、热和EMI屏蔽性能，使其与工业应用高度相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.