Mechanical, Thermal, Electrical Characteristics and EMI Absorption Shielding Effectiveness of Rubber Composites Based on Ferrite and Carbon Fillers.

Ján Kruželák,Jarmila Vilčáková,Klaudia Hložeková,Roderik Plavec,Ivan Hudec,Rastislav Dosoudil,Andrea Kvasničáková,Marek Gořalík

doi:10.3390/polym13172937

Abstract

In this work, rubber composites were fabricated by incorporation of manganese-zinc ferrite alone and in combination with carbon-based fillers into acrylonitrile-butadiene rubber. Electromagnetic parameters and electromagnetic interference (EMI) absorption shielding effectiveness of composite materials were examined in the frequency range 1 MHz–3 GHz. The influence of ferrite and fillers combination on thermal characteristics and mechanical properties of composites was investigated as well. The results revealed that ferrite imparts absorption shielding efficiency to the composites in tested frequency range. The absorption shielding effectiveness and absorption maxima of ferrite filled composites shifted to lower frequencies with increasing content of magnetic filler. The combination of carbon black and ferrite also resulted in the fabrication of efficient EMI shields. However, the EMI absorption shielding effectiveness was lower, which can be ascribed to higher electrical conductivity and higher permittivity of those materials. The highest conductivity and permittivity of composites filled with combination of carbon nanotubes and ferrite was responsible for the lowest absorption shielding effectiveness within the examined frequency range. The results also demonstrated that combination of ferrite with carbon-based fillers resulted in the enhancement of thermal conductivity and improvement of mechanical properties.

Highlights

Electromagnetic interference can be defined as a kind of environmental pollution produced by electronic, radiation and electro-communication devices
The first part of the study was aimed at the preparation of composites filled with magnetic soft manganese-zinc ferrite into matrix based on NBR
Electromagnetic parameters and absorption shielding ability of composites were examined within low frequencies

Summary

Introduction

Electromagnetic interference can be defined as a kind of environmental pollution produced by electronic, radiation and electro-communication devices. Efficient methods and materials have been developed to reduce EMI in the surrounding and to protect the functionality of electronic devices and human health. The combination of three shielding mechanisms plays the crucial role in reducing or eliminating of EMI. Those mechanisms are absorption, reflection and multiply reflection of electromagnetic radiation [5,6,7]. Foam and porous materials exhibit high specific surface, while large phase interfaces have composites filled with different types of fillers. Such materials usually show good ability of multiply reflection

Methods

Results

Conclusion