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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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Published on: September 19, 2020

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.

Keywords:

MWCNTs electromagnetic shielding effectiveness ionic liquid polymer composites transition metal oxide

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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.