PT/BORAX COMPOSITE AS A HIGH DIELECTRIC CONSTANT MATERIAL WITH LOWER DIELECTRIC LOSS

Year 2017, Volume: 18 Issue: 5, 1089 - 1097, 31.12.2017

Mehmet Kılıç , Yaşar Karabul Zeynep Güven Özdemir , Orhan İçelli

Abstract

In recent years, high dielectric
constant composites have been considered as the key materials for many
cutting-edge applications such as supercapacitors, memory devices, electrical,
mechanical, and biochemical engineering. However, the high dielectric loss at
low frequencies become a crucial problem which makes the composite unsuitable
for these technological applications. In this respect, this work has been
devoted to prepare a new high dielectric constant composite material with low
dielectric loss. From this point of view, Polythiophene /Na₂B₄O₇ (PT/Borax)
composites with different borax contents varying from 10.0 wt.% to 50.0 wt.% have been prepared. The morphology and chemical structure of the composites as
well as pure PT have been determined by Scanning Electron Microscopy (SEM) and
Fourier Transformed Infrared (FTIR) Spectroscopy, respectively. The dielectric
properties of the samples have been measured within 100Hz-16.5MHz frequency
region at room temperature. The polymer composite with high dielectric constant
and low dielectric loss at low frequency for various technological applications
has been achieved for 50.0 wt.% Borax additive. The dielectric relaxation
mechanism of the samples have also been identified as non-Debye type. The
electrical conductivity properties of the samples have also been discussed in
terms of Jonscher’s Universal power law.

Keywords

High dielectric constant, low dielectric loss, polymer composites, polythiophene, borax

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