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
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>&#963;</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&#8211;12.4 GHz), showing a good agreement with the measured results.</p>