Gujral, Parth and Varshney, Swati and Dhawan, S. K. (2016) Designing of Multiphase Fly Ash/MWCNT/PU Composite Sheet Against Electromagnetic Environmental Pollution. Journal of Electronic Materials , 45 (6). pp. 3142-3148. ISSN 0361-5235

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Abstract

Fly ash and multiwalled carbon nanotubes (MWCNT) reinforced multiphase polyurethane (PU) composite sheets have been fabricated by using a solution casting technique. Utilization of fly ash was the prime objective in order to reduce environmental pollution and to enhance the shielding properties of PU polymer. Our study proves that fly ash particles with MWCNTs in a PU matrix leads to novel hybrid high performance electromagnetic shielding interference material. Scanning electron microscopy confirms the existence of fly ash particles along with MWCNTs in a PU matrix. This multiphase composite shows total shielding effectiveness of 35.8 dB (> 99.99% attenuation) in the Ku-band (12.4-18 GHz) frequency range. This is attributed to high dielectric losses of reinforcement present in the polymers matrix. The Nicolson-Ross-Weir algorithm has been applied to calculate the electromagnetic attributes and dielectric parameters of the PU samples by using scattering parameters (S (11), S (22), S (12), S (21)). The synthesized multiphase composites were further characterized by using x-ray diffraction, Fourier transform infrared spectroscopy, and thermo gravimetric analysis.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s IEEE.
Uncontrolled Keywords:	PU, MWCNT, EMI shielding, composite
Subjects:	Engineering > Electronics and Electrical Engineering Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	17 Nov 2017 07:46
Last Modified:	17 Nov 2017 07:46
URI:	http://npl.csircentral.net/id/eprint/2180

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