材料科学
复合材料
热塑性聚氨酯
电磁屏蔽
电磁干扰
碳纳米管
复合数
极限抗拉强度
纳米复合材料
电磁干扰
聚氨酯
制作
弹性体
电子工程
医学
替代医学
病理
工程类
作者
Jiahong Niu,Tai-Bao Yang,Xinyuan Li,Ling Xu,Hao Lin,Gan‐Ji Zhong
标识
DOI:10.1021/acs.iecr.3c01409
摘要
Segregated conductive polymer composites (CPCs) have important application prospects in the field of electromagnetic interference (EMI) shielding but suffer from weak mechanical properties that significantly limit their practical applications. In this work, three-dimensional (3D) printing is employed to construct continuous thermoplastic polyurethane (TPU) scaffolds with different interlayer angles of π/5, π/4, π/3, 2π/5, and π/2. Subsequent carbon nanotube (CNT) dip-coating and hot-pressing lead to the successful fabrication of co-continuous segregated CNT/TPU (CNT/TPU-CCS) composites. It is found that the composites not only achieve high EMI shielding properties but also obtain excellent mechanical properties. With only 4.0 wt % of CNT, the CNT/TPU-CCS composites with the interlayer angle of π/3 (CNT/TPU-CCS-π/3) exhibit a high electrical conductivity of 42.2 S/m and a remarkable EMI shielding effectiveness (EMI SE) of 43.1 dB, which are 75% and 72%, respectively, higher than that of the CNT/TPU composites with conventional segregated structure. The CNT/TPU-CCS-π/3 composites also have superior mechanical properties, showing a tensile strength and elongation at break of 17.8 MPa and 377.3%, respectively, which are 196.8% and 1540.6% higher than those of the conventional segregated CNT/TPU composite. This work provides a new facile, economic, and efficient strategy to construct segregated CPCs with both high EMI shielding performance and mechanical properties, and could promote the practical application of segregated CPCs in the next-generation electronic devices.
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