A STUDY ON THE DIELECTRIC PROPERTIES OF POLYPYRROLE-BENTONITE COMPOSITES
Abstract
- The main aim of the research work is to study the dielectric properties of the prepared polypyrrole-bentonite composites. Firstly, polypyrrole was prepared by chemical oxidative polymerization of pyrrole in aqueous medium using ferric chloride as an oxidant. Bentonite clay as filler was collected from Ta Da U Township, Mandalay Region. The polypyrrole-bentonite composites were prepared by various w/v ratios of pure bentonite/pyrrole (1:3, 2:3, 3:3 g/mL) and designated as PPy-B 1, PPy-B 2 and PPy-B 3, respectively. The prepared polypyrrole was characterized by FT IR, XRD and TG-DTA. Polypyrrole-bentonite composites were also characterized by FT IR, XRD, TG-DTA, and SEM. Dielectric behaviour of polymer composites were investigated in the 1-10 MHz frequency range and at different voltages (6 V and 10 V) by LCR measurements. According to XRD, the sharp peak of bentonite in PPy-B composites was shifted toward lower angle with low intensity. SEM micrographs show that the prepared polymer composites have denser and more compact surface morphology with increasing amount of bentonite clay. It was also found that thermal stability of polypyrrole-bentonite composite was enhanced with an increase amount of bentonite clay. From FT IR, polymer-clay composites have the characteristics peaks of both polypyrrole and bentonite's functional groups. Dielectric permittivities decreased with increase in frequency for all composites due to the typical behaviour of dielectric properties. It was observed that, as the amount of bentonite in the composites increased, dielectric permittivities decreased while the dielectric conductivity of composites increased.
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Year
- 2019
Author
-
Aye Myat Maw
Subject
- Chemistry
Publisher
- Myanmar Academy of Arts and Science (MAAS)