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2018-11-30

Sodium Salt of Polyethylene-Co-Methacrylic Acid Ionomer/Polyaniline Binary Blends for EMI Shielding Applications

By Kingsley Kema Ajekwene, Jelmy Elavathingal Johny, and Thomas Kurian
Progress In Electromagnetics Research C, Vol. 88, 207-218, 2018
doi:10.2528/PIERC18093003

Abstract

Improvement of properties of polymeric materials through blending is a way to obtain products with highly adapted performance for specific applications. The present work reports the design and preparation of binary blend films of poly (ethylene-co-methacrylic acid) neutralized using sodium salt (EMAANa) and nano polyaniline doped with hydrochloric acid (nano PANI-HCl) or toluene sulfonic acid (nano PANI-TSA) with the aim of achieving improved thermal stability, DC conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of EMAANa. The binary blends were prepared by solution blending using a solvent mixture of toluene/1-butanol (90:10) at 65 °C. The hybrid materials were characterized and evaluated by FTIR, UV-Vis spectroscopy, XRD spectroscopy and thermogravimetric analysis (TGA). The electrical conductivity of the PANI and PANI/EMAANa blends was measured by four-probe method. The EMI shielding effectiveness was studied using a wave-guide coupled to an Agilent Synthesized Sweeper 8375A and a Hewlett-Packard spectrum analyzer 7000 in the X band frequency range (8-12 GHz). FTIR indicates a π-π and hydrogen bonding interaction between PANI and EMAANa, enabling the PANI to be adsorbed in the ionomer. The TGA of the blends show similar weight loss pattern with nano PANI-TSA-EMAANa exhibiting slightly lower weight loss below the decomposition temperature. The TGA results show that thermal stability of the blends is better compared to pure EMAANa. The results of measurements of electrical conductivity and EMI SE demonstrates that PANI was successfully blended into the EMAANa substrate.

Citation


Kingsley Kema Ajekwene, Jelmy Elavathingal Johny, and Thomas Kurian, "Sodium Salt of Polyethylene-Co-Methacrylic Acid Ionomer/Polyaniline Binary Blends for EMI Shielding Applications," Progress In Electromagnetics Research C, Vol. 88, 207-218, 2018.
doi:10.2528/PIERC18093003
http://www.jpier.org/PIERC/pier.php?paper=18093003

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