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Electromagnetic shielding of multiwalled, bamboo-like carbon nanotube/methyl vinyl silicone composite prepared by liquid blending

Articles

Journal/Conference:

COMPOSITE INTERFACES

Language:

English

Author:

Lin Jin; Zhang Haiyan; Li Ping; Yin Xijiang; Chen Yiming; Zeng Guoxun

Year:

2014

Volume:

21

Issue:

6

Pages:

553-569

Keywords:

polymer-matrix composites; microstructures; carbon nanotube; electrical properties; electromagnetic interference shielding

Multiwalled, bamboo-like carbon nanotube (BCNT)/methyl vinyl silicone (MVQ) composites with different concentrations of BCNT were fabricated by liquid blending method with an aim to investigate the behavior of such composites as effective electromagnetic interference shielding material in the frequency range of 1-6GHz. The morphology and structure of BCNT were characterized and elucidated. Scanning electron microscopy examination showed that the BCNTs homogeneously dispersed in MVQ. The electrical conductivity (sigma) and shielding effectiveness (SE) of the composite were measured and discussed. The results showed that the BCNTs/MVQ composites had a relatively low percolation threshold at 0.92wt. % BCNT, and the sigma showed a decreasing linear relation with temperature, i.e., the sigma slightly decreased with increasing temperature. The BCNTs/MVQ composites with SE of 33-38dB were obtained at 7wt. % BCNT loading. Shielding mechanism was studied by resolving the total incident energy into absorbed, reflected, and transmitted contribution, and the result showed that the dominated shielding mechanism was reflection loss.