Improvement of Thermal Stability and Electrical Properties of Polyaniline through Hybrid Nanocomposites PANi/PVA/CaO

(Osama Saber, Sobhy S. Ibrahim, Mohamed Abu-Abdeen, Adil Alshoaibi, and Abdullah El-Naeim)

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Abstract

Single polymer cannot achieve all demands to advance new technologies. Therefore, the combination of two or more polymers or metal oxides leads to a polymer with superior properties compared to that of the discrete components. Hence, the present study aims to improve both the electrical properties and the thermal stability of polyaniline through three nanocomposites based on organic-inorganic nanohybrids. Three nanocomposites were prepared with different weight ratios of polyaniline to polyvinyl alcohol and fixed weight ratio of calcium oxide nanoparticles. The thermal analyses showed higher thermal stability of the three phase nanocomposites compared to the protonated polyaniline. Both DC and AC electrical characterizations showed that the highest concentration of polyaniline gave a semi-metallic behavior for polyvinyl alcohol at low voltages. Also, the AC parameters (Z’, Z’’) showed varying behaviors for all the prepared nanocomposites at different temperatures. Where, the impedance of the nanocomposite increased in the temperature range from 30 °C to 80 °C and then decreased monotonically from 90 °C to 140 °C. This electrical behavior showed very interesting outcomes, which opens up new horizons for many applications for such three phase composites, especially in the field of electronics and sensors. Key Words: Electrical properties, Nanocomposites, PANi/PVA/CaO, Thermal stability.
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