Construction of self-healing polycaprolactone composite foams with segregated structure for superior electromagnetic interference shielding

IF 11.2 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science & Technology Pub Date : 2025-01-14 DOI:10.1016/j.jmst.2024.12.019

Xin Yan, Hexin Zhang, Weihua Gu, KeunByoung Yoon

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引用次数: 0

Abstract

Electromagnetic interference shielding materials are inevitably damaged during service, causing a serious decline in their shielding performance. Therefore, it is urgent to develop polymer-based composites with excellent electromagnetic shielding and self-healing properties. In this study, a layered foam/film structure polycaprolactone composite characterized by electric/magnetic bifunctionality was constructed by a hot-pressing process and supercritical carbon dioxide foaming. The microcellular framework offers rich heterogeneous interfaces and improves electromagnetic attenuation capabilities. Such a reasonable construction of asymmetric shielding networks optimizes the impedance matching, while the incident electromagnetic waves form a special attenuation mode of “absorption-reflection-reabsorption”. The polycaprolactone composite foam exhibits an excellent electromagnetic interference shielding effectiveness of 53.6 dB in the X-band and a low reflection value of only 0.36, effectively reducing secondary pollution. In addition, the damaged polycaprolactone composite foam exhibits over 93% electromagnetic interference shielding effectiveness and healing efficiency, ensuring the long-term stability of the material in practical applications.

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具有隔离结构的自愈聚己内酯复合泡沫材料的制备及其优越的电磁屏蔽性能

电磁干扰屏蔽材料在使用过程中难免会损坏，导致屏蔽性能严重下降。因此，开发具有优异电磁屏蔽和自修复性能的聚合物基复合材料迫在眉睫。本研究通过热压工艺和超临界二氧化碳发泡，构建了一种具有电/磁双功能特性的层状泡沫/薄膜结构聚己内酯复合材料。微孔框架提供了丰富的异质界面，提高了电磁衰减能力。这种非对称屏蔽网络的合理构造优化了阻抗匹配，同时入射电磁波形成了 "吸收-反射-再吸收 "的特殊衰减模式。聚己内酯复合泡沫在 X 波段的电磁干扰屏蔽效果达到 53.6 dB，反射值低至 0.36，有效减少了二次污染。此外，受损的聚己内酯复合泡沫的电磁干扰屏蔽效果和愈合效率均超过 93%，确保了材料在实际应用中的长期稳定性。

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来源期刊

Journal of Materials Science & Technology 工程技术-材料科学：综合

CiteScore

20.00

自引率

11.00%

发文量

995

审稿时长

13 days

期刊介绍： Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.