Özet:

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.

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