Multifunctional Lightweight Segregated CNT ‐Reinforced EVA / LDPE Foams With Superior Piezoresistive Characteristic and EMI Shielding Performance

IF 3.6 4区工程技术 Q2 ENGINEERING, CHEMICAL

Polymer Engineering and Science Pub Date : 2026-01-16 DOI:10.1002/pen.70364

Haohao Hou, Linqi Lu, Hui Ma, Hongfu Zhou, Xiangdong Wang, Munan Qiu, Xiaoling Zang

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引用次数: 0

Abstract

ABSTRACT The rapid development of 5th generation communication and wearable electronic devices has increased the demand for lightweight and flexible materials with excellent electromagnetic interference (EMI) shielding performance and piezoresistive sensing characteristics. Herein, cold/hot pressing was combined with supercritical CO 2 foaming to prepare segregated carbon nanotube (CNT)/ethylene‐vinyl acetate copolymer (EVA)/low‐density polyethylene (LDPE) sheets and related foams, exhibiting superior sensitivity and EMI shielding effectiveness (SE). Benefiting from the segregated distribution of CNT, CNT/EVA/LDPE sheets exhibited excellent conductivity of 0.38 S cm −1 . The composite foam with 6 phr CNT achieved a maximum absolute EMI SE of 113 dB (g/cm 2 ) −1 in the X‐band (8.2–12.4 GHz) while maintaining high sensitivity (GF = 4.4), perfectly balancing piezoresistive sensing and EMI shielding performance. Apart from pure EVA/LDPE, the mechanism for EMI shielding in CNT/EVA/LDPE sheets was primarily based on reflection, while that of segregated CNT/EVA/LDPE foam was chiefly ascribed to absorption. Moreover, the segregated CNT/EVA/LDPE foam could accurately detect human motion, further demonstrating their practical application potential. This study provides new insights into the development of lightweight, multifunctional materials for EMI shielding and advances next‐generation functional materials for flexible electronics and wearable devices.

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具有优异压阻特性和电磁干扰屏蔽性能的多功能轻质分离碳纳米管增强EVA / LDPE泡沫

随着第五代通信和可穿戴电子设备的快速发展，对具有优异电磁干扰屏蔽性能和压阻传感特性的轻质柔性材料的需求日益增加。本文将冷压/热压与超临界co2发泡相结合，制备了分离的碳纳米管(CNT)/乙烯-醋酸乙烯共聚物(EVA)/低密度聚乙烯（LDPE）片材和相关泡沫，具有优异的灵敏度和EMI屏蔽效果（SE）。得益于碳纳米管的分离分布，碳纳米管/EVA/LDPE片材具有0.38 S cm−1的优异导电性。具有6 phr碳纳米管的复合泡沫在X波段（8.2-12.4 GHz）实现了113 dB (g/ cm2)−1的最大绝对EMI SE，同时保持了高灵敏度（GF = 4.4），完美地平衡了压阻传感和EMI屏蔽性能。除纯EVA/LDPE外，CNT/EVA/LDPE片材屏蔽EMI的机理主要是基于反射，而分离的CNT/EVA/LDPE泡沫片材屏蔽EMI的机理主要是吸收。此外，分离的CNT/EVA/LDPE泡沫可以准确地检测人体运动，进一步展示了其实际应用潜力。这项研究为开发用于电磁干扰屏蔽的轻质多功能材料提供了新的见解，并推动了柔性电子和可穿戴设备的下一代功能材料的发展。

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

Polymer Engineering and Science 工程技术-高分子科学

CiteScore

5.40

自引率

18.80%

发文量

329

审稿时长

3.7 months

期刊介绍： For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer science and technology. The importance of PE&S is underscored by the frequent rate at which its articles are cited, especially by other publications - literally thousand of times a year. Engineers, researchers, technicians, and academicians worldwide are looking to PE&S for the valuable information they need. There are special issues compiled by distinguished guest editors. These contain proceedings of symposia on such diverse topics as polyblends, mechanics of plastics and polymer welding.