Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black.

Ján Kruželák,Rastislav Dosoudil,Marek Gořalík,Ivan Hudec,Andrea Kvasničáková,Klaudia Hložeková

doi:10.3390/polym13040616

Ján Kruželák, Rastislav Dosoudil + Show 4 more

Open Access

https://doi.org/10.3390/polym13040616

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Abstract

In the present work, composite materials were prepared by incorporation of manganese-zinc ferrite, carbon black and combination of ferrite and carbon black into acrylonitrile-butadiene rubber (NBR). For cross-linking of composites, standard sulfur-based curing system was applied. The main goal was to investigate the influence of the fillers on the physical-mechanical properties of composites. Then, the electromagnetic absorption shielding ability was investigated in the frequency range 1 MHz–3 GHz. The results revealed that composites filled with ferrite provide sufficient absorption shielding performance in the tested frequency range. On the other hand, ferrite behaves as an inactive filler and deteriorates the physical-mechanical characteristics of composites. Carbon black reinforces the rubber matrix and contributes to the improvement of physical-mechanical properties. However, composites filled with carbon black are not able to absorb electromagnetic radiation in the given frequency range. Finally, the combination of carbon black and ferrite resulted in the modification of both physical-mechanical characteristics and absorption shielding ability of hybrid composites.

Highlights

The rapid progress in today’s modern society has been connected with the development of high amount of electronic and communication devices
The electromagnetic interference shielding effectiveness can be understood as the sum of reflection, absorption and multiply reflection of EMI [3,4,5]
The preparation procedure of composites filled with carbon black and magnetic filler proceeded in the same way as in the previous case, but NBR/Carbon black (CB) batch was first compounded with pure NBR to reduce the amount of CB to 20 phr

Summary

Introduction

The rapid progress in today’s modern society has been connected with the development of high amount of electronic and communication devices. Manganese-zinc ferrite as magnetic filler and carbon black as the commonly used carbon-based filler were solely used for the fabrication of composite materials with the utilization of NBR as the rubber matrix. Carbon black was combined with ferrite and incorporated into the rubber matrix with the aim to modify both the tensile characteristics and absorption shielding performance. For the preparation of rubber compounds with carbon black, the NBR/CB batch containing 25 phr of CB was first fabricated using the kneading machine Buzuluk. The preparation procedure of composites filled with carbon black and magnetic filler proceeded in the same way as in the previous case, but NBR/CB batch was first compounded with pure NBR to reduce the amount of CB to 20 phr. Thin sheets (width 15 × 15 cm, thickness 2 mm) of cured rubber compounds were obtained

Investigation of Physical-Mechanical Characteristics

Investigation of Shielding Characteristics

Microscopic Analysis

Microscopic analysis

Results and Discussion