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<p>Poly(ether-block-amide) (PEBAX®) composites containing varied MWCNT (multi-walled carbon nanotube) contents were fabricated via hot pressing and melt compounding in the present work. The influences of MWCNT amounts on electromagnetic interference (EMI) shielding effectiveness (SE), mechanical behaviours, specific conductance, and pressure sensitivity were investigated in detail. It was found that EMI SE and specific conductance increased with an increased MWCNT loading, whereas the brittleness accordingly worsened significantly. The MWCNT/PEBAX® composites presented a relatively low percolation threshold of 0.58&#xa0;vol%, and more than 99% of the EM wave could be screened with 8.69&#xa0;vol% MWCNT, showing an average EMI SE of 26.44&#xa0;dB. The mechanical behaviours, especially ductility and flexibility, were also examined, and the rectilinear subatmospheric pressure ratio for drag was increased when the external-pressure stimulus increased. Additionally, the excellent stability and repeatability of sensing were demonstrated after stabilization through the loading of the circulating pressure. Therefore, the MWCNT/PEBAX® conductive polymer composite can be widely applied to sensitive wearable electronics.</p>

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Enhancing electromagnetic shielding with smart, pressure-sensitive MWCNT/PEBAX® composites

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Jianying Deng,
  • Jiushuai Deng,
  • Biao Zhao,
  • Chongxiang Zhao,
  • Ruosong Li,
  • Zhongyi Bai,
  • Mahdi Hamidinejed,
  • Li Ma,
  • Chul B. Park

摘要

Poly(ether-block-amide) (PEBAX®) composites containing varied MWCNT (multi-walled carbon nanotube) contents were fabricated via hot pressing and melt compounding in the present work. The influences of MWCNT amounts on electromagnetic interference (EMI) shielding effectiveness (SE), mechanical behaviours, specific conductance, and pressure sensitivity were investigated in detail. It was found that EMI SE and specific conductance increased with an increased MWCNT loading, whereas the brittleness accordingly worsened significantly. The MWCNT/PEBAX® composites presented a relatively low percolation threshold of 0.58 vol%, and more than 99% of the EM wave could be screened with 8.69 vol% MWCNT, showing an average EMI SE of 26.44 dB. The mechanical behaviours, especially ductility and flexibility, were also examined, and the rectilinear subatmospheric pressure ratio for drag was increased when the external-pressure stimulus increased. Additionally, the excellent stability and repeatability of sensing were demonstrated after stabilization through the loading of the circulating pressure. Therefore, the MWCNT/PEBAX® conductive polymer composite can be widely applied to sensitive wearable electronics.