Polyaniline nanorod adsorbed on reduced graphene oxide nanosheet for enhanced dielectric, viscoelastic and thermal properties of epoxy nanocomposites

Abstract

In this work, polyaniline nanorod adsorbed on reduced graphene oxide (P@G) hybrid filler was prepared via in situ polymerization of aniline monomer in the presence of reduced graphene oxide as template. Fourier transform infrared, X‐ray diffraction, field emission scanning electron microscopy, and high‐resolution transmission electron microscopy images revealed the formation of P@G hybrid. The P@G hybrid was dispersed in dichlorobenzene and then introduced into epoxy resin at different loadings. The epoxy nanocomposites containing 9 wt% P@G hybrids (E/P@G9) exhibited a maximum DC conductivity of 1.34 × 10−5 S/cm that is eight orders higher compared to pure epoxy. At 103 Hz, a dielectric constant (ε′) of 163 was attained for E/P@G9, nearly 34 times higher than pure epoxy. A percolation threshold of 4 vol% was observed for ε′. Dynamic mechanical studies showed that significant enhancement in storage modulus values were exhibited for 3 and 5 wt% of hybrids. The glass transition temperature showed a maximum shift of 10°C to higher temperatures at 3 wt% loading of P@G hybrids (E/P@G3). The tensile strength, Young's modulus, and impact strength of the E/P@G3 nanocomposites enhanced by 19.7, 72, and 12%, respectively. The thermal stability of the epoxy nanocomposites also enhanced with the addition of P@G hybrid.

Shape‐controlled synthesis of polyaniline and its synergistic effect with reduced graphene oxide for the fabrication of flexible electrode

“…Apparently, it is the interaction between the PANI and rGO that has promotes the delocalization of electrons from the polymer backbone, which subsequently increase the electrical conductivity. 72,73 In conclusion, the electrode film composed of a rGO/PANI mass ratio of 0.5 gave the lowest specific resistivity. The specific resistivity result obtained in this work followed a fairly similar pattern with the electrical conductivity result published by.…”

“…In contrast, the resistivity of pure PANI electrode film (i.e., rGO mass ratio = 0) was determined to be 0.029 ± 0.003 Ωcm, which is slightly higher than that in rGO‐PANI composite. Apparently, it is the interaction between the PANI and rGO that has promotes the delocalization of electrons from the polymer backbone, which subsequently increase the electrical conductivity 72,73 …”

The Effect of Zirconia Nanoparticles on Thermal, Mechanical, and Corrosion Behavior of Nanocomposite Epoxy Coatings on Steel Substrates

“…A two-step thermal degradation profile is observed in all the prepared samples. The initial stage of degradation starts above 100 °C, while the second stage of degradation started above 300 °C and continued up to 500 °C, where the major changes in chain decomposition happen [ 13 , 14 ]. Table 3 summarizes the temperature extracted from the TGA curves at 15, 25, 50, and 75% weight loss.…”

Synergistic Effect of Nanoparticles: Enhanced Mechanical and Corrosion Protection Properties of Epoxy Coatings Incorporated with SiO2 and ZrO2

“…The first stage of initial decomposition started after surpassing the 100 °C mark, followed by the main decomposition event starting from 300 °C to 500 °C. The major changes in the coating or evaluation of thermal properties is dependent on this second degradation stage [ 32 , 33 ].…”

“…The mathematical expressions below are the representative of calculating the values of hardness and modulus. where hardness is represented by H, F max represents maximum load applied, A represents the projected area of contact at maximum load, E is the samples modulus, ʋ represents the materials poisons ratio (for polymer = 0.35), E r is the reduced modulus obtained from indentation, E i represents the modulus of indenter (1141 GPa for diamond) and ʋ i is the poisons ratio of indenter (0.07 for diamond) [ 32 , 43 ].…”