X‐band dielectric properties of hybrid nanocomposites of nitrogen‐doped carbon nanotube/functionalized nanoclay/polyvinylidene fluoride nanocomposite

Abstract

This study investigates the effect of functionalized nanoclay on dielectric properties in the X‐band (8.2‐12.4 GHz) of synthesized nitrogen‐doped carbon nanotube (N‐CNT)/nanoclay/polyvinylidene fluoride (PVDF) nanocomposites prepared via melt‐mixing. Montmorillonite nanoclay was functionalized by an aminosilane coupling agent, making the nanoclay more compatible with the organic polymer. N‐CNT was synthesized employing a chemical vapor deposition technique. Transmission electron microscopy and optical microscopy were used to assess the morphology of nanocomposites. The incorporation of nanoclay improved the dielectric properties, that is, dissipation factor of N‐CNT/PVDF nanocomposites. For instance, incorporation of 0.5 wt% nanoclay into N‐CNT/PVDF nanocomposite at 1.0 wt% N‐CNT loading resulted in 61% reduction in the dissipation factor (from 0.18 ± 0.01 to 0.07 ± 0.01). The percolation threshold increased from 0.3 to 1.0 wt% of N‐CNT by incorporation of 0.5 wt% nanoclay, which expanded the percolation region. In addition, incorporation of 0.5 wt% nanoclay reduced agglomeration area ratio of 1.0 wt% N‐CNT/PVDF nanocomposite by 57%. Rheological results indicated collapse of N‐CNT networks upon addition of nanoclay to the N‐CNT/PVDF nanocomposite, which confirmed the dielectric results. Nitrogen heteroatoms (scattering centers) and functionalized nanoclay were responsible for reducing the dissipation factor.

Multilayer Structures of a Zn0.5Ni0.5Fe2O4-Reduced Graphene Oxide/PVDF Nanocomposite for Tunable and Highly Efficient Microwave Absorbers

“…This is also shown by the rheological results (see Figure S3). , However, according to Figure a, with the introduction of only 0.5 wt % of rGO, the electrical conductivity of the PVDF/rGO nanocomposite surged to the conductive region, that is, 6.87 × 10 –3 S/cm. By increasing the loading of rGO nanosheets up to 1 wt %, the network structure was further enhanced, and more conductive paths were formed throughout the PVDF/rGO sample, contributing to the sharp enhancement of the electrical conductivity (1.41 × 10 –2 S/cm).…”

A Simple Approach to Control the Physical and Chemical Features of Custom-Synthesized N-Doped Carbon Nanotubes and the Extent of Their Network Formation in Polymers: The Importance of Catalyst to Substrate Ratio

“…The reduction in G ′ is a direct consequence of nanofillers network break up and filler-matrix slippage, leading to a decrease in the number of load-bearing junctions [ 48 , 49 , 50 , 51 , 52 ]. Moreover, it was shown that, for a strong-linked network, the critical strain amplitude decreases to lower values by the introduction of more nanofillers into the polymer media [ 4 , 52 , 53 ]. This is due to the higher sensitivity of the rigid 3D network structure of the nanofillers to the input deformation (i.e., strain amplitude) [ 53 , 54 ].…”

“…Moreover, it was shown that, for a strong-linked network, the critical strain amplitude decreases to lower values by the introduction of more nanofillers into the polymer media [ 4 , 52 , 53 ]. This is due to the higher sensitivity of the rigid 3D network structure of the nanofillers to the input deformation (i.e., strain amplitude) [ 53 , 54 ].…”

Electrical properties of polymer blend composites based on Silicone rubber/EPDM/clay for high voltage insulators

“…Therefore, the greater the polarization capacity of the molecules, the greater the dielectric constant of the material. The improvement in nanocomposite dielectric features attributed to the addition of nanoclays depends on the quality and proportion of the nanoclay [27]. The filler is polarized by the introduction of an external electric field, causing a charge disturbance in the nanoclays.…”