Abstract
This study focuses on the electromagnetic interference shielding effectiveness (EMI SE), dissipation of electrostatic discharge (ESD), and surface resistivity of polymer blends between polycarbonate (PC) and acrylonitrile–butadiene–styrene (ABS) filled with carbon black powder (CBp) and carbon black masterbatch (CBm). The mixtures of PC/ABS/CB composites were prepared by the injection molding for the 4-mm thickness of the specimen. The D-optimal mixture design was applied in this experiment. The EMI SE was measured at the frequency of 800 and 900 MHz with a network analyzer, MIL-STD-285. The result showed that the EMI SE was increased when the amount of filler increased. The surface resistivity of the composites was determined according to the ASTM D257. It was found that the surface resistivity of the plastic with no additives was 1012 Ω/ square. When the amount of fillers was added, the surface resistivity of plastic composites decreased to the range of 106–1011 Ω/square, which was suitable for the application without the electrostatic discharge. The optimization of multi-response showed using high amounts of PC and CB was the best mixture of this research.
Highlights
Nowadays, plastics, especially thermoplastics, are formed and used for many applications such as parts of automotive, electronic devices, and packaging
The results showed that when higher black mixing ratio, the SEratio, was increased byincreased both testing the additive usingcarbon a higher carbon black mixing the Shielding effectiveness (SE) was by frequencies both testingbecause frequencies because isthe the additive conductive material, allowing the plastic composite to reflect and absorb the electromagnetic is the conductive material, allowing the plastic composite to reflect and absorb the wave
The results showed that using a high amount of PC and carbon black (CB) optimized the mixture, which gave the high EMI shielding effectiveness for each testing frequency but gave the low surface resistivity that was about 107 Ω/square
Summary
Plastics, especially thermoplastics, are formed and used for many applications such as parts of automotive, electronic devices, and packaging. In order to prevent those problems, there were many researchers that have studied and developed electromagnetic interference shielding and dissipative material. The material which has high performance for electromagnetic interference shielding effectiveness (EMI SE) is metal, due to high conductive properties. It has limitations such as weight, cost, processability, and corrosion [2]; plastic becomes the material of choice. There are many researchers who have developed and improved the EMI SE and dissipative plastic composites instead of metal, normally, the plastic is electrically insulated and does not contribute to electromagnetic interference shielding. Plastic that is the matrix of the composite can connect the Processes 2020, 8, 616; doi:10.3390/pr8050616 www.mdpi.com/journal/processes
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