Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Ştefan Ursache,Vlad Scarlatache,Andrei Niagu,Romeo Cristian Ciobanu

doi:10.4028/www.scientific.net/aef.8-9.353

Ştefan Ursache, Vlad Scarlatache + Show 2 more

Open Access

https://doi.org/10.4028/www.scientific.net/aef.8-9.353

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Abstract

The paper highlights the most important dielectric features for some nanocomposites polymer matrix based on polypropylene (PP) with insertion of carbon nanotubes multi-walled (MWCNTs). The dielectric characteristics analyzed are the real permittivity and dielectric losses of the sample based on PP with 5% insertion of MWCNTs. The measurements are made in a range of frequency between 1 MHz to 3 GHz. The composite form was also analyzed through computer modeling and simulation and electromagnetic properties for EMC shielding applications are also considered. PP/MWCNTs composite with shielding effectiveness of 15-20 dB was investigated through modeling and simulation at about 5% MWCNTs filling. Shielding mechanism was estimated by calculating the total shielding effectiveness (SE) into absorption and reflection loss. PP/MWCNTs composite indicates a shielding mostly by absorption mechanism; therefore it also can be used in other microwave applications or like a radar absorbing material. The effect of MWCNTs affects the electrical conductivity of the nanocomposite. The proposed material shows some interesting electromagnetic compatibility (EMC) properties and promises better performance using different amounts of MWCNTs.

Highlights

Electromagnetic interference (EMI) shielding is an unwelcome electromagnetic (EM) induction caused by wide use of alternative current/voltage and produces accidentally induced signals in the vicinity of the electronic circuits, thereby trying to fault its performance
There are illustrated the dielectric characteristics and electromagnetic behavior of a nanocomposite polymer matrix based on polypropylene (PP) with insertion of multiwall carbon nanotubes (MWCNTs)
This paper presents the dielectric characteristics of a polymer nanocomposite material with insertion of multilayer nanotubes carbon

Summary

Introduction

Electromagnetic interference (EMI) shielding is an unwelcome electromagnetic (EM) induction caused by wide use of alternative current/voltage and produces accidentally induced signals (voltage and current) in the vicinity of the electronic circuits, thereby trying to fault its performance. Classical cellular solids used in shields/absorbers and Salisbury screen applications are either massive metallic or metal-multilayer structures. These material solutions do not offer enough degrees of freedom to the EM designer especially at GHz frequency domain, neither do they offer optimised configuration for the structural loading or thermal effects they have to bear. The request to reduce the weight and the cost of these „safety” structures requires the replacement of metal by novel materials like conducting polymers and composites These composites may include metal insertions, carbon, chemical substances or other inserted components with good dielectric conductivity [3]. There are illustrated the dielectric characteristics and electromagnetic behavior of a nanocomposite polymer matrix based on polypropylene (PP) with insertion of multiwall carbon nanotubes (MWCNTs)

Materials and methods

Conclusions