Thermal and microwave-absorbing properties of doped polyaniline–epoxy nanocomposites for stealth applications

• Published in: Journal of materials research 2024-01, Vol.39 (1), p.126-136
• Main Authors: Pratap, Vivek, Hussain, Aasim, Katiyar, Rajesh, Soni, Amit K., Katiyar, Mohit, Agarwal, Kavita, Baskey, Himangshu B., Dubey, Ashish, Abbas, S. M., Nath, Ravindra
• Format: Article
• Language: English
• Subjects: Applied and Technical Physics; Biomaterials; Broadband; Chemical synthesis; Chemistry and Materials Science; Complex permittivity; Crystallites; Dielectric properties; Frequency ranges; Heterostructures; Inorganic Chemistry; Materials Engineering; Materials research; Materials Science; Microwave absorption; Nanocomposites; Nanotechnology; Network analysers; Polyanilines; Thermodynamic properties
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/s43578-023-01125-3

The thermal properties of polymeric nanocomposites can be examined using TGA and DSC techniques, while dielectric properties can be examined through simulated scattering (S11, S12, S21, and S22) parameters. Polyaniline (PAni) nanopowder was synthesized using chemical oxidative polymerization techniques. Consequently, the crystallite size and morphology of the synthesized powder were examined using the XRD, TEM, and FESEM techniques. Further, a series of polymeric nanocomposites was developed via wet mixing and compressor molding techniques for various volume percentages (54.0, 57.5, 60.1, and 61.7 vol%) of synthesized powder within PAni/epoxy composites. Consequently, dielectric and absorbing properties have been measured using a vector network analyzer and its software module. The computed complex permittivity data were used to evaluate the absorption for different thicknesses of samples. A minimum reflection loss of − 22.3 dB (> 99.9% absorption) was optimized with broadband frequency ranges. The unique heterostructures of nanocomposite are responsible for the enhanced absorption and shielding performance. Graphical abstract