Electromagnetic interference shielding effectiveness of conductive carbon black and carbon fiber‐filled composites based on rubber and rubber blends

Abstract

ABSTRACT:Conductive rubber-based composites were derived from EVA, EPDM, and 50/50 EVA/EPDM blend filled with carbon black and short carbon fiber (SCF). The electromagnetic interference (EMI) shielding effectiveness and return loss were studied. The measurements of shielding effectiveness (SE) of the composites were carried out in two different frequency ranges: 100 -2,000 MHz and 8 -12 GHz (X-band). It has been observed that the shielding effectiveness of the composites is frequency dependent and increases with increasing frequency. The increasing of filler loading also enhances the SE of the composites. It is also found that 50/50 EVA/EPDM blend systems have higher shielding effectiveness than pure EVA and EPDM SCF-filled composites. The ADVANCES IN POLYMER TECHNOLOGY 227 EMI SHIELDING EFFECTIVENESS OF CARBON COMPOSITEScorrelation between shielding effectiveness and bulk conductivity of various composites is also discussed.

Carbon black‐filled immiscible polypropylene/epoxy blends

“…9,15 CB-filled immiscible polymer blends with low percolation threshold and enhanced conductivity have found application in conductive or antistatic materials, 8 -17 positive temperature coefficient (PTC) materials, 19,20 liquids or chemical vapor sensors, 22,23 and electromagnetic interference (EMI) shielding. 24 All the reported work about CB-filled immiscible polymer blends is based on nonpolar/nonpolar, 9,18 nonpolar/polar, 10,15 polar/polar thermoplastics, 25 or plastic/rubber and rubber/rubber blends. 16,24 In this paper, CB-filled immiscible thermoplastic/thermosetting polymer blends consisting of polypropylene (PP) and epoxy resin were investigated for the first time.…”

“…24 All the reported work about CB-filled immiscible polymer blends is based on nonpolar/nonpolar, 9,18 nonpolar/polar, 10,15 polar/polar thermoplastics, 25 or plastic/rubber and rubber/rubber blends. 16,24 In this paper, CB-filled immiscible thermoplastic/thermosetting polymer blends consisting of polypropylene (PP) and epoxy resin were investigated for the first time. The PP/epoxy/CB blends with varied compositions and different processing sequences were prepared by melt-mixing method.…”

Electromagnetic interference shielding effect of nanocomposites with carbon nanotube and shape memory polymer

“…The shield should be in high conductance, thus metals, such as steel, copper, aluminum, etc., are the most common materials used for EMI shielding. Since metal shielding has shortcomings of heavy weight, corrosion and physical rigidity, polymer composites with discontinuous conducting fillers, such as metal particles, carbon particles, carbon fiber, are extensively employed in EMI shielding [8][9][10][11][12][13]. Although these composites are not strong enough for most structural applications, they are attractive because of their superior molding and more dependable lightweight.…”

Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process

“…Also, it can be observed that EMI SE decreases with increasing frequency. Even though composites and their foams usually exhibit a fairly frequency-independent EMI SE behavior in the X-band range, there are some reports of frequency-dependent EMI SE behavior, which has been attributed to an inhomogeneous distribution of conductive fillers within the polymer matrix [56][57][58]. In the current study, similar inhomogeneities could have been caused during formation and growth of the cellular structure, as graphene nanoparticles were being sheared and dispersed within the polycarbonate matrix.…”