Lightweight and Anisotropic Porous MWCNT/WPU Composites for Ultrahigh Performance Electromagnetic Interference Shielding

Advanced Functional Materials - Tập 26 Số 2 - Trang 303-310 - 2016
Zhihui Zeng1,2, Hao Jin1, Mingji Chen1, Weiwei Li1,2, Licheng Zhou3, Zhong Zhang1
1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, P.R. China
2University of Chinese Academy of Sciences, Beijing 100049, P.R. China
3State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University Beijing 100871 P.R. China

Tóm tắt

Lightweight, flexible and anisotropic porous multiwalled carbon nanotube (MWCNT)/water‐borne polyurethane (WPU) composites are assembled by a facile freeze‐drying method. The composites contain extremely wide range of MWCNT mass ratios and show giant electromagnetic interference (EMI) shielding effectiveness (SE) which exceeds 50 or 20 dB in the X‐band while the density is merely 126 or 20 mg cm−3, respectively. The relevant specific SE is up to 1148 dB cm3 g−1, greater than those of other shielding materials ever reported. The ultrahigh EMI shielding performance is attributed to the conductivity of the cell walls caused by MWCNT content, the anisotropic porous structures, and the polarization between MWCNT and WPU matrix. In addition to the enhanced electrical properties, the composites also indicate enhanced mechanical properties compared with porous WPU and CNT architectures.

Từ khóa


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Thông tin
Thông tin xuất bản

Advanced Functional Materials

Tập 26 Số 2

303-310

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