Electrical conductivity of multiwalled carbon nanotubes/polyester polymer nanocomposites

Abstract

Electrical conductivity of polyester filled with carbon nanotubes composites have been studied from 240 to 380 K in the frequency range from 100 Hz to 1 MHz as a function of the filler volume fraction above the percolation threshold. The frequency dependence of the electrical conductivity obeys the universal dynamic response. Positive temperature coefficient in resistivity and negative temperature coefficient in resistivity phenomena were observed at temperatures below and above the glass transition respectively. It was found that the mechanism responsible for the changes in resistivity is predominantly due to the tunneling effect. Positive temperature coefficient in resistivity intensity was also exploited which is strongly dependent on the carbon nanotube content.

Remarkable change in the broadband electrical behavior of poly(vinylidene fluoride)–multiwalled carbon nanotube nanocomposites with the use of different processing routes

“…The values of s and ω o for the nanocomposites are shown in Table , whereas the values of σ dc from the plateau of σ(ω) are shown in Table . As the amount of MWCNTs increased in the PVDF matrix, the s values decreased, and ω 0 increased; this was an indication of the transition from an insulating behavior to a completely conductive behavior . In the solution‐mixed samples, the values of s gradually decreased with MWCNT loading, whereas for the melt‐mixed samples, an abrupt decrease from 0.95 to 0.12 was observed.…”

“…In addition, the difference between the conductivity of the samples was higher at low ω than at high ω. For CPNs and disordered solids, σ(ω) can be related to σ dc by the empirical Jonscher's law: where A and s are parameters dependent on the concentration, temperature, and morphology of the conductive fillers. σ dc represents the plateau of the σ(ω) curves, and the term A (ω) S represents its increasing portion.…”

Flexible conductive poly(styrene‐butadiene‐styrene)/carbon nanotubes nanocomposites: Self‐assembly and broadband electrical behavior

“…As expected, the parameter ω 0 increases with MWCNT loading, which is an indication of the transition from the insulating behavior (1) to a completely conductive behavior (3). It is known that a value of s = 1 is related to a capacitive behavior, while s = 0 is related to a resistive behavior . When 0.8 < s < 1.0, the behavior is characteristic of conduction by hopping .…”

Effects of carbon black content and size on conductive properties of filled high‐density polyethylene composites

“…There have been studies to focus on the electrical properties of polymer composites and the factors for influencing the distribution of CB in the composites, including the affinity of CB to different polymers, the interfacial tension between the particles and the polymer matrix, and viscosity ratio of the polymer components. [14][15][16][17] Kymakis and Amaratunga [14] found, when the single-walled carbon nanotubes (SWNTs) concentration increased from 0 to 20 wt.%, the conductivity of the resulting films was dramatically increased by six orders of magnitude. In the previous work, Liang and Yang studied the electrical properties and morphology of the HDPE/ethylene-vinyl acetate copolymer/CB composites, [10] and the resistivity relaxation behavior of the HDPE/CB conductive composites.…”