Surface Resistivity and EMI Shielding Effectiveness of Polyaniline Coated Polyester Fabric

N. Muthukumar, G. Thilagavathi Govindarajan

Abstract


In this study electrically conductive polyester fabrics were prepared by using conductive polyaniline polymer. The conductive fabrics were prepared by in-situ chemical oxidative polymerization of aniline using ammonium persulphate as the oxidant by a process of diffusion polymerization in a mixed bath.

These fabrics were characterized by ATR-FTIR, WAXD, SEM, DSC and two-probe conductivity. The evaluation of electromagnetic shielding effectiveness of the polyaniline treated fabrics was carried out using Agilent E5061A/E5062A ENA series RF network analyzer. The structural studies show that the crystalline region of fabric structure is not affected by the polyaniline and the interaction of polyaniline molecules with fabric molecules. The SEM studies reveal a very uniform deposition of polyaniline molecules on the fabrics. The thermal studies show that the PANI-treated fabrics have better thermal stability. The conductivity studies show that the treated fabrics have good electrical conductivity with the resistance value of 5 K ohm/sq. The EMI Shielding tests show that polyaniline treated polyester fabric has the Electromagnetic Interference value of -2.78 dB and which makes it a promising candidate for EMI Shielding and Anti static discharge matrix for the encapsulation of the micro electronic devices
Index Terms — conductive fabrics, insitu-polymerisation, polyaniline, surface resistance

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