TiO₂ reinforced polymeric nanocomposites of HCl‐doped polyaniline and their properties

Abstract

Polyaniline (PANI)‐titanium dioxide (TiO2) nanocomposite was synthesized via in‐situ polymerization in acidic medium using ammonium per sulfate as oxidant. The formation of nanocomposite was examined by Fourier transform‐infrared spectroscopy, X‐ray diffraction, field effect scanning electron microscopy, and energy dispersive X‐ray spectroscopy, respectively. The dielectric properties were examined using LCR meter in the frequency range 100 Hz–5 MHz and it was explained in terms of complex dielectric permittivity and electrical modulus. The optical properties were examined using UV‐VIS spectroscopy in the wavelength range 200–800 nm. The thermal properties were examined in the temperature range 30°C–800°C. The improved performance in dielectric, electrical, optical, and thermal properties enables PANI‐TiO2 nanocomposite for its use in actuators, dynamic random access memory, and semiconductor devices. POLYM. COMPOS., 38:E108–E117, 2017. © 2016 Society of Plastics Engineers

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

“…However, with an increase in the incorporation of TiO 2 , ε ″ predominately increases which is mainly due to the increase in mobile charge carriers in the interface, facilitating the leakage of current. Irrespective of the TiO 2 loading level, the high value of ε ″ particularly at lower frequency is attributed to the high resistivity offered by the grain boundaries 31 . Furthermore, ε ″ mostly depends on the space charge polarization of the dipoles.…”

“…Increased conductive networks and a decrease in R B value significantly explain the high extent of the polarizability of the closely spaced dipoles and their high energy storage ability. The coupling activity of IL facilitates the polarization, conduction and high capacitance of the nanocomposite system 31 …”

“…Irrespective of the TiO 2 loading level, the high value of ε 00 particularly at lower frequency is attributed to the high resistivity offered by the grain boundaries. 31 Furthermore, ε 00 mostly depends on the space charge polarization of the dipoles. The value of ε 00 is higher in TiO 2 -loaded systems and the value is increased up to a loading level of 1.5 wt%.…”

“…The coupling activity of IL facilitates the polarization, conduction and high capacitance of the nanocomposite system. 31…”

Polyaniline–calcium titanate perovskite hybrid composites: Structural, morphological, dielectric and electric modulus analysis

“…Different formalisms like loss tangent, electric modulus, and dielectric loss can be used to interpret dielectric spectra. According to McCrum 42 formalism, the real (M ′ ) and imaginary (M ″ ) parts of the complex electric modulus can be calculated from ε ′ and ε ″ values using the relations 43 …”