A Facile Method in Fabricating Flexible Conductive Composites with Large-Size Segregated Structures for Electromagnetic Interference Shielding.

IF 4.2 3区 化学 Q2 POLYMER SCIENCE Macromolecular Rapid Communications Pub Date : 2024-10-26 DOI:10.1002/marc.202400585
Liang He, Yang Chen, Xiaoming Shao, Qiyuan Yao, Ding Feng, Lijie Yin, Wencai Wang
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Abstract

To resist the plastic deformation of polymer particles during hot press molding, high molecular weights, and moduli are required for composites with segregated structures, thus the prepared composites exhibit poor flexibility. Also, larger particle sizes can bring lower percolation thresholds while the ensuing greater deformation destroys the conductive network. Moreover, segregated composites still face preparation complexities. Herein, a facile method for developing flexible composites with large-size segregated structures is proposed. First, silver-coated polydopamine-modified reduced graphene oxide (Ag@PrGO), as conductive fillers, is prepared by electroless plating. Next, polydimethylsiloxane (PDMS)-coated polyolefin elastomer (POE) beads are put into a bag containing the fillers. After a simple shaking, the fillers are adhered to the POE surface as the cohesive property of cured PDMS. Finally, flexible composites with large-size segregated structures are obtained via hot pressing. Benefiting from the 2D structure of the Ag@PrGO and the ability to slip, the conductive networks possess adaptable deformability. The prepared composites exhibit excellent electrical conductivity (203.55 S cm-1) at filler volume fractions of 3.4 vol%. The EMI shielding effectiveness can reach 70 dB in the X-band at a thickness of 1.9 mm and remains stable after bending and rubbing damage. This work paves the way for constructing large-size segregated structures.

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制造具有大尺寸分段结构的柔性导电复合材料以屏蔽电磁干扰的简便方法。
为了在热压成型过程中抵抗聚合物颗粒的塑性变形,具有离析结构的复合材料需要较高的分子量和模量,因此制备的复合材料柔韧性较差。此外,较大的颗粒尺寸会降低渗流阈值,而随之而来的较大变形会破坏导电网络。此外,离析复合材料仍然面临着复杂的制备问题。本文提出了一种开发具有大尺寸离析结构的柔性复合材料的简便方法。首先,通过无电解电镀制备出银涂层聚多巴胺改性还原氧化石墨烯(Ag@PrGO)作为导电填料。然后,将涂有聚二甲基硅氧烷(PDMS)的聚烯烃弹性体(POE)珠子放入装有填料的袋子中。经过简单的摇晃,填料就会利用固化 PDMS 的内聚性粘附在 POE 表面。最后,通过热压获得具有大尺寸分离结构的柔性复合材料。得益于 Ag@PrGO 的二维结构和滑移能力,导电网络具有可适应的变形能力。所制备的复合材料在填料体积分数为 3.4 vol% 时具有优异的导电性(203.55 S cm-1)。厚度为 1.9 毫米时,X 波段的电磁干扰屏蔽效果可达 70 dB,并且在弯曲和摩擦损伤后仍能保持稳定。这项研究为建造大尺寸隔离结构铺平了道路。
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来源期刊
Macromolecular Rapid Communications
Macromolecular Rapid Communications 工程技术-高分子科学
CiteScore
7.70
自引率
6.50%
发文量
477
审稿时长
1.4 months
期刊介绍: Macromolecular Rapid Communications publishes original research in polymer science, ranging from chemistry and physics of polymers to polymers in materials science and life sciences.
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