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Enhanced Dielectric Constant for Efficient Electromagnetic Shielding Based on Carbon-Nanotube-Added Styrene Acrylic Emulsion Based Composite
oleh: Chen Changxin, Zhang Song, Ni Yuwei, Cai Seng, Huang Jie, Li Yong, Li Jiang-Tao
Format: | Article |
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Diterbitkan: | SpringerOpen 2010-01-01 |
Deskripsi
<p>Abstract</p> <p>An efficient electromagnetic shielding composite based on multiwalled carbon nanotubes (MWCNTs)-filled styrene acrylic emulsion-based polymer has been prepared in a water-based system. The MWCNTs were demonstrated to have an effect on the dielectric constants, which effectively enhance electromagnetic shielding efficiency (SE) of the composites. A low conductivity threshold of 0.23 wt% can be obtained. An EMI SE of ~28 dB was achieved for 20 wt% MWCNTs. The AC conductivity (<it>σ</it> <sub>ac</sub>) of the composites, deduced from imaginary permittivity, was used to estimate the SE of the composites in X band (8.2–12.4 GHz), showing a good agreement with the measured results.</p>