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Investigation of microstructure, electrical behavior, and EMI shielding effectiveness of silicone rubber/carbon black/nanographite hybrid composites
Author(s) -
Jeddi Javad,
Katbab Ali Asghar,
Mehranvari Mahsa
Publication year - 2019
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.25266
Subject(s) - materials science , composite material , percolation threshold , carbon black , silicone rubber , electromagnetic shielding , electrical conductor , percolation (cognitive psychology) , natural rubber , graphite , emi , dielectric , electrical resistivity and conductivity , electromagnetic interference , electronic engineering , electrical engineering , optoelectronics , neuroscience , biology , engineering
In this study, electrical properties and electromagnetic interference shielding effectiveness (EMI SE) of composites based on room temperature vulcanizing silicone rubber (RTV‐SR) and hybrid conductive fillers (carbon black [CB]) and graphite nanoplate [GNP]) were studied. The role of GNP/CB ratio on developed conductive networks, electrical properties, as well as electromagnetic interference (EMI) shielding effectiveness of composites was investigated in comparison with SR/CB and SR/GNP composites. Dielectric properties of hybrid composites were controlled by the dominant filler phase. Nevertheless, all hybrid nanocomposites with a higher fraction of CB in GNP/CB hybrid systems showed a lower percolation threshold and higher EMI SE. The frequency dependency of the AC conductivity revealed tunneling conduction mechanism below the percolation threshold, while above the percolation threshold, the direct contact mechanism played the dominant role of transferring electrical current. EMI shielding measurements over X‐band frequency demonstrated absorption loss as the main mechanism for the attenuation of the incident EM wave intensity in hybrid composites. POLYM. COMPOS., 40:4056–4066, 2019. © 2019 Society of Plastics Engineers