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Enhancing EMI shielding of natural rubber-based supercritical CO2 foams by exploiting porous morphology and CNT segregated network

Abstract

Natural rubber/carbon nanotubes composite foams (F-NR/CNTs) with high electrical conductivity and excellent electromagnetic interference (EMI) performance were developed through a multi-steps process including: a) CNTs assembling on natural rubber latex particles, b) pre-crosslinking of natural rubber, c) supercritical carbon dioxide foaming of pre-crosslinked composite samples and d) post-crosslinking of foamed composite samples. Closed-cell porous structure and segregated-CNT network are clearly observed in the resulting foams. Due to this morphology, F-NR/CNTs exhibit low density, good mechanical properties, and high electrical conductivity. Owing to the multiple radiation reflections and scattering between the cell-matrix interfaces, the composite foams presented an excellent specific shielding effectiveness (SSE) of 312.69 dB cm2/g for F-NR/CNTs containing 6.4wt% of CNTs, which is significantly higher than those already published for rubber composites containing comparable filler content. Furthermore, the analysis of EMI SE highlights that absorption efficiency is more significant than reflection efficiency, implying that most of incident electromagnetic radiation is dissipated in form of heat. This work provides the fundamentals for the design of innovative lightweight and efficient EMI shielding foams, characterized by a three-dimensional segregated CNTs network with valuable potentials in the electronics and aerospace industries.

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Publication details

The article was received on 10 Sep 2018, accepted on 03 Dec 2018 and first published on 04 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR07351A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Enhancing EMI shielding of natural rubber-based supercritical CO2 foams by exploiting porous morphology and CNT segregated network

    Y. Zhan, M. Oliviero, J. Wang, A. Sorrentino, G. Buonocore, L. Sorrentino, M. Lavorgna, H. Xia and S. Iannace, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07351A

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