Abstract
The paper presents the synthesis and characterization of carbon black/silicone dioxide hybrid fillers obtained by an impregnation technology. The electromagnetic interference shielding effectiveness of the composites filled with carbon black/silicone dioxide hybrid fillers was measured in wide frequency range of 1 - 12 GHz. The dc and ac electrical conductivity of composites also have been investigated. The relationship between electrical (dc and ac) conductivity and shielding effectiveness was analyzed. A positive correlation was found between the absorptive shielding effectiveness and ac conductivity for composites comprising conductive carbon black/silica filler, when the filler loading is above the percolation threshold.
Highlights
The aim of the paper is to investigate the influence of type of filler and percolation threshold on the correlation between electrical conductivity and shielding effectiveness of natural rubber based composite loaded with three types of hybrid carbon black/silicon dioxide fillers obtained by an impregnation technology using carbon black of different characteristics as a substrate
The role of type of filler and percolation threshold on the correlation between electrical conductivity and shielding effectiveness of natural rubber based composite loaded with three types of hybrid carbon black/silicon dioxide fillers obtained by an impregnation technology using carbon black of absolutely different characteristics as a substrate has been discussed thoroughly
It has been observed that electromagnetic interference (EMI) shielding effectiveness of composites comprising carbon black/silica hybrid fillers is primarily affected by the percolation behaviour of composites
Summary
The importance of preventing electromagnetic interference (EMI) on diverse. Open Access design and develop EMI shielding materials/composites to eliminate the harmful effects of electromagnetic radiation. A considerable number of studies investigated the application of rubber composite materials as EMI shields and radar absorbing materials [3]-[9]. There are no literature data on the correlation between electrical conductivity and EMI shielding effectiveness (SE) of natural rubber based (NR) composites loaded with carbon black/silicone dioxide hybrid fillers in wide frequency range of 1 - 10 GHz. The aim of the paper is to investigate the influence of type of filler and percolation threshold on the correlation between electrical conductivity and shielding effectiveness of natural rubber based composite loaded with three types of hybrid carbon black/silicon dioxide fillers obtained by an impregnation technology using carbon black of different characteristics as a substrate
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