The influence of nano-Fe on the electromagnetic shielding properties of nano-Fe/carbon fiber/LDPE composites

Nano-Fe/carbon fiber/ Low-density polyethylene (LDPE) composites were prepared by melt compounding. The electromagnetic shielding properties of nano-Fe/CF/LDPE composites as a function of nano-Fe mass content were investigated. The data of DC electrical conductivity evidence percolation behavior of...

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Bibliographic Details
Published in:e-Polymers 2009-12, Vol.9 (1), p.1127-1140
Main Authors: Na, Xie, Qingjie, Jiao, Chongguang, Zang, Chenglong, Wang
Format: Article
Language:English
Subjects:
Carbon fiber
Electromagnetic interference
Nano-Fe
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Summary:Nano-Fe/carbon fiber/ Low-density polyethylene (LDPE) composites were prepared by melt compounding. The electromagnetic shielding properties of nano-Fe/CF/LDPE composites as a function of nano-Fe mass content were investigated. The data of DC electrical conductivity evidence percolation behavior of the composites, and percolation threshold descends with the increase of nano- Fe. When the CF/LDPE composites reach the percolation threshold ( =0.10), “double percolation” appears in the nano-Fe/ CF/LDPE composites as continuously adding nano-Fe into the CF/LDPE composites, and the percolation threshold of the “double percolation” is 0.10 mass fraction of CF and 0.08 mass fraction of nano-Fe, which result in at least 10 orders of magnitude greater than that of CF/LDPE composites. The data of Initial DC permeability r, coercivity , saturation magnetization and residual magnetization of nano-Fe/CF/LDPE composites at the magnetic field intensity between -2500 G and 2500 G enhance with increasing addition of nano-Fe. The value of relative permeability decreases as the loading of nano-Fe is increased from 0.04 to 0.19 mass fraction in frequency ranges of 300 KHz-100 MHz. The EMI SE in frequency ranges of 300KHz-100MHz increase with the addition of nano-Fe, and mechanism of electromagnetic shield for nano-Fe/CF/LDPE composites is compound shielding mechanism with reflection loss and absorption loss . Absorption loss increases significantly with increasing addition of nano-Fe from 0.04 to 0.19 mass fraction, and increasing trend of reflection loss slow down as mass fraction of the fillers reach percolation threshold.
ISSN:2197-4586
1618-7229
1618-7229
DOI:10.1515/epoly.2009.9.1.1127