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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
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Ion-Electron-Conducting Polymer Composites: Promising Electromagnetic Interference Shielding Material
Manoj Kumar Vyas1, Amita Chandra1
1Department of Physics and Astrophysics, University of Delhi , Delhi 110007, India.
ACS Applied Materials & Interfaces
|June 29, 2016
Summary
This study developed advanced polymer nanocomposites for electromagnetic shielding. The materials achieved high conductivity and significant absorption-based shielding effectiveness, demonstrating their potential for effective electromagnetic interference mitigation.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Polymer nanocomposites are explored for electromagnetic interference (EMI) shielding.
- Enhancing conductivity and dielectric properties is crucial for effective shielding.
Purpose of the Study:
- To prepare and characterize polymer nanocomposites for electromagnetic shielding applications.
- To investigate the effect of ionic liquids and carbon nanotubes on conductivity and EMI shielding.
Main Methods:
- Preparation of poly(vinylidenefluoride-co-hexafluoropropylene) (PVdF-HFP) based nanocomposites.
- Inclusion of LiBF4, EMIMBF4, multiwalled carbon nanotubes (MWCNTs), and Fe3O4 nanoparticles.
- Complex impedance spectroscopy to analyze conductivity and dielectric properties.
Main Results:
- The nanocomposites exhibited improved conductivity up to ~1.86 mS/cm.
- High ionic conductivity from ionic liquids and electron conduction network from MWCNTs contributed to enhanced conductivity.
- Significant EMI shielding effectiveness of ~46 dB in the Ku band, with absorption contributing ~42 dB.
Conclusions:
- The developed polymer nanocomposites show excellent potential as electromagnetic shield materials.
- The combination of ionic and electronic conduction pathways is key to high shielding performance.
- Absorption is the dominant mechanism for the observed EMI shielding effectiveness.
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