Enhanced Dielectric Constant for Efficient Electromagnetic Shielding Based on Carbon-Nanotube-Added Styrene Acrylic Emulsion Based Composite |
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| Authors: | Yong Li Changxin Chen Jiang-Tao Li Song Zhang Yuwei Ni Seng Cai Jie Huang |
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| Affiliation: | (1) Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing, 100101, People’s Republic of China;(2) National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai, 200240, China;(3) Graduate School of the Chinese Academy of Science, Beijing, 100039, People’s Republic of China;(4) P.O. Box 7220, Beijing, 100072, People’s Republic of China; |
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| Abstract: | 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 (σ
ac) 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. |
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| Keywords: | Multiwalled carbon nanotubes Electromagnetic interference shielding Complex permittivity Styrene acrylic emulsion |
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