Exploring the effect ofTiO₂and ionic liquid on the dielectric properties of polyurethane and polyaniline blend nanocomposites

Abstract

Conductive polymer nanocomposites are enormously potent multifunctional lightweight flexible materials used in various electronic devices owing to their excellent dielectric characteristics with interesting relaxation behavior. In this present context, dielectric properties like dielectric permittivity (ε′), dielectric loss (ε″), AC conductivity (σac), real and imaginary impedance (Z′ and Z″), Nyquist plots, etc., of thermoplastic polyurethane/polyaniline/TiO2 (TPU/PANI/TiO2) nanocomposite films with 0–2 wt% TiO2 loading level have been studied. The dielectric analysis in the frequency range of 1 Hz to 1 MHz reveals that ε', σac, Nyquist plot as well as the relaxation behavior have been effectively tuned up to 1.5 wt% TiO2 loading level. The very high interfacial polarization of the dipoles at the interface is reflected in the ultrahigh value of ε′. The semicircular nature of the Nyquist plots is well explained by the cyclic movement of the charge and the high extent of charge storage. The significant improvement in dielectric properties in 1‐butyl‐3‐methylimidazolium hexafluorophosphate ionic liquid (IL)‐incorporated nanocomposite system reflects the coupling as well as dispersibility of IL. The reduction in ε′ and σac, and increase in bulk resistance with an increase in temperature indicate the positive temperature coefficient behavior of the developed nanocomposite systems. The adequate interaction between TiO2, TPU and PANI phases has been analyzed using X‐ray diffraction. The significant dispersing ability and coupling activity of the IL has been explored from micrographs obtained from a scanning electron microscopy study. © 2021 Society of Industrial Chemistry.

Fabrication of Multiwalled Carbon Nanotubes (MWCNT) and Reduced Graphene Oxide (rGO)‐based thermoplastic polyurethane and polypyrrole nanocomposites for electromagnetic wave absorption application with a low reflection

“…Both random and uniform distributions of MWCNT in the 95:5 system have been observed. 34 Overall, the dense dispersion pattern of RGO, as well as the MWCNT phases in the bulk of the nanocomposite systems, are well observed from the obtained FESEM photomicrographs. 35…”

“…However, the formation of rGO clusters in the proximity of TPU and PPy is essential for facilitating efficient internal multiple reflections, ultimately leading to high EMISE characteristics. Both random and uniform distributions of MWCNT in the 95:5 system have been observed 34 . Overall, the dense dispersion pattern of RGO, as well as the MWCNT phases in the bulk of the nanocomposite systems, are well observed from the obtained FESEM photomicrographs 35 …”