Abstract
Multifunctional conductive nanocomposites based on thermoplastic polycarbonate (PC), dodecylbenzenesulphonic acid doped polyaniline (PANI-DBSA) and bismuth sulfide (BS) with good thermal and dielectric properties have been fabricated using solution casting technique. In the present work, different percentages of PANI-DBSA were blended with PC-BS composite and their electrical and dielectric properties as well as microstructural features were experimentally investigated. Analysis of positron lifetime data yielded three components, and it was observed that the increase in positron lifetime parameter viz., o-Ps lifetime at the higher concentration of PANI-DBSA, and also increase in the ortho-positronium (o-Ps) intensity at lower weight percentages of the filler may be ascribed to the increase in the interfacial space by phase separation of PANI-DBSA, BS and PC polymer matrix, and the formation of additional cavities at the interfaces of PC/BS/PANI-DBSA conducting composite, respectively. A decrease in the o-Ps intensity on the increase in filler level may be the consequence of decrease in the number of free volume holes that are available for electron—positron annihilation, due to the aggregation of PANI-DBSA. These observations are corroborated by other experimental investigations, like X-ray diffraction, electron microscopy, infrared spectroscopy, differential scanning calorimetry and thermogravimetric analysis. Further, the effect of PANI-DBSA loading in PC-BS composite on the dielectric relaxation behavior has been studied over a wide range of frequencies, from 40 Hz up to 5 MHz. The presence of two semicircular arcs in the Cole–Cole plot of the composite confirms the existence of grain and grain boundary conduction in the nanocomposite. Good AC conductivity and permittivity, together with good thermal stability makes the PC/BS/PANI-DBSA conducting composite a potential candidate for electromagnetic interference shielding and energy storage applications.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
References
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Acknowledgements
The authors would like to thank Manipal Institute of Technology, Manipal for providing the XRD scans of the sample. The authors thank USIC, Mangalore University, Mangalore for providing an ATR-FTIR facility to scan the samples. The authors would like to thank the Indian Institute of Technology, Kanpur for providing the facility to scan SEM images of samples. PALS measurements were performed using the facility at the Saha Institute of Nuclear Physics, Kolkatta, India.
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SM and MA have made substantial contributions to the conception and acquisition of experimental data. PMGN has involved in the analysis and interpretation of data. RM has participated in determining the experimental results, designing, analyzing data and drafting the manuscript. BL has corrected the paper and given final approval for the version to be published. All authors read and approved the final version of the manuscript.
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Mirji, R., Lobo, B., Mukherjee, S. et al. Influence of Polyaniline as Filler on the Microstructural Features and Properties of Polycarbonate: Bismuth Sulfide Nanocomposite. J Inorg Organomet Polym 34, 1232–1255 (2024). https://doi.org/10.1007/s10904-023-02886-4
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DOI: https://doi.org/10.1007/s10904-023-02886-4