Best practices for correlating electrical conductivity with broadband EMI shielding in binary filler-based conducting polymer composites

Junpyo Hong, Jisung Kwon, Dohyun Im, Jeonggil Ko, Chae Yun Nam, Hyeong Gyu Yang, Sun Ho Shin, Soon Man Hong, Seung Sang Hwang, Ho Gyu Yoon, Albert S. Lee

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16 Citations (Scopus)

Abstract

Multiple conductive fillers (MWCNT, GNP, Cu@Ag dendrite, EGain) were incorporated in a commercial polypropylene matrix through melt processing. Electrical conductivity, thermal conductivity, and EMI shielding properties of the fabricated composites were examined according to various filler compositions, and it was confirmed that the properties varied according to shape, composition, and mutual compatibility of the particulate fillers. In particular, at broadband frequencies (X-, Ka-, W- band), the EMI shielding properties reached 32.6 dB (at 10 GHz), 39.3 dB (at 28 GHz), 51.1 dB (at 77 GHz) for composites comprising of PC15 (0.3 mm) and the EMI shielding mechanisms according to the material thickness (0.3, 0.5, 1 mm) and the filler content were studied. As the frequency increased from 8.2–110 GHz, the reflection properties decreased from 90.93 % to 80.99 % (at 0.3 mm), and the absorption properties increased 9.01 % to 19.01 % even for PC15 (0.3 mm). In particular, the correlation between the type of electrical conductivity and the EMI shielding properties were investigated using a theoretical (Simon, Drude) model.

Original languageEnglish
Article number140528
JournalChemical Engineering Journal
Volume455
DOIs
Publication statusPublished - 2023 Jan 1

Bibliographical note

Funding Information:
This work was supported by the by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) (CRC22031-000), National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2020M3H4A3106354, 2020M3H4A3106403), as well as the Materials Architecturing Research Center Institutional Program of Korea Institute of Science of Technology. J. Hong fabricated the composites and measured the electrical, EMI, and thermal properties. J. Kwon provided the theoretical analysis. D. Im, J. Ko, C.Y. Nam, H.G. Yang, S.H. Shin, S.M. Hong, and S.S. Hwang helped with the characterization of polymer composites. H.G. Yoon and A.S. Lee supervised the work and wrote the manuscript.

Funding Information:
This work was supported by the by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIT) ( CRC22031-000 ), National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2020M3H4A3106354, 2020M3H4A3106403), as well as the Materials Architecturing Research Center Institutional Program of Korea Institute of Science of Technology.

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • Complex permittivity
  • Electrical conductivity
  • Electromagnetic interference shielding
  • Thermal conductivity
  • Thermoplastic resins

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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