Table of Contents
Journal of Polymers
Volume 2014 (2014), Article ID 193058, 7 pages
http://dx.doi.org/10.1155/2014/193058
Research Article

Permittivity and Electromagnetic Interference Shielding Investigations of Activated Charcoal Loaded Acrylic Coating Compositions

1Department of Physics, Jamia Millia Islamia, New Delhi 110025, India
2CSIR-National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India

Received 6 March 2014; Revised 4 April 2014; Accepted 4 April 2014; Published 4 May 2014

Academic Editor: Yves Grohens

Copyright © 2014 Sharief ud Din Khan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Acrylic resin (AR) based electromagnetic interference (EMI) shielding composites have been prepared by incorporation of up to 30 wt% activated charcoal (AC) in AR matrix. These composites have been characterized by XRD, Raman spectroscopy, scanning electron microscopy, dielectric, and EMI shielding measurement techniques. XRD patterns and Raman studies confirm the incorporation of AC particles inside AR matrix and suggest possible interactions between phases. The SEM images show that incorporation of AC particles leads to systematic change in the morphology of composites especially the formation of porous structure. The dielectric measurements show that 30 wt% AC loading composite display higher relative permittivity value (~79) compared to pristine AR (~5). Further, the porous structure, electrical conductivity, and permittivity value contribute towards EMI shielding effectiveness value of −36 dB (attenuation of >99.9% of incident radiation) for these composites, thereby demonstrating their suitability for making efficient EMI shielding coatings.