Highly efficient electromagnetic interference shielding and superior mechanical performance of carbon nanotube/polydimethylsiloxane composite with interface-reinforced segregated structure

材料科学 聚二甲基硅氧烷 复合材料 碳纳米管 电磁屏蔽 复合数 电磁干扰 极限抗拉强度 电磁干扰 聚合物 计算机科学 电信
作者
Rui-Yu Ma,Shuangqin Yi,Jie Li,Jia-Le Zhang,Wen-Jin Sun,Li‐Chuan Jia,Ding‐Xiang Yan,Zhong‐Ming Li
出处
期刊:Composites Science and Technology [Elsevier]
卷期号:232: 109874-109874 被引量:30
标识
DOI:10.1016/j.compscitech.2022.109874
摘要

The formation of segregated structure in conductive polymer composite is an effective strategy to improve electromagnetic interference (EMI) shielding performance. However, inferior mechanical properties always existed in the segregated composite due to weak interfacial adherence or defects. Herein, an interface-reinforced segregated structure was constructed in a carbon nanotube (CNT)/polydimethylsiloxane (PDMS) composite by creating chemical bonds between PDMS microcells and the continuous PDMS interfacial phase embedded with CNT. The interface-reinforced segregated composites achieved the integration of excellent EMI shielding and good mechanical properties. Specifically, the resultant composite exhibited a superior EMI shielding effectiveness (EMI SE) of 47.0 dB at only 2.2 vol% CNT content. The tensile strength and elongation at break of the composite were 3.6 MPa and 87.0%, increased by 35.0 and 7.0 times in comparison to the conventional segregated composite. The interface-reinforced segregated composite also demonstrated excellent reliability with high EMI SE retention of 80% even after suffering from 1000 stretching-releasing cycles at a terminal strain of 30%. This work provides an important guideline for the development of high-performance polymer composite with efficient EMI shielding and good mechanical performances.
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