The effective conductivity of polymer carbon nanotubes (CNT) nanocomposites

Zare, Yasser; Rhee, Kyong Yop

doi:10.1016/j.jpcs.2019.03.006

Cited by 77 publications

(30 citation statements)

References 46 publications

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“…By fitting the experimental levels of electrical conductivity to above equation, "ϕ p " and "b" values can be assessed, as reported in many studies [30,34,35]. The previous studies have indicated that the waviness decreases the conductivity of CNT [56]. Accordingly, "σ N " parameter can be expressed by: So, Equation (7) can be developed by substituting of Equations (8), (4) and (1) for CNT conductivity, effective filler fraction and percolation threshold, respectively as:…”

Section: Theoretical Analysismentioning

confidence: 96%

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Zare

Rhee

2020

Polymers

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The interphase layer surrounding nanoparticles can reflect the tunneling effect as the main mechanism of charge transferring in polymer/carbon nanotube (CNT) nanocomposites (PCNT). In this paper, the percolation threshold, effective volume fraction of CNT, and the portion of percolated filler after percolation are expressed by interphase and CNT waviness. Moreover, the developed terms are used to suggest the influences of CNT dimensions, interphase thickness, and waviness on the electrical conductivity of PCNT by conventional and developed models. Thin and long CNT, thick interphase, and low waviness obtain a high fraction of percolated CNT. However, the highest level of effective filler fraction is only calculated by the thinnest CNT and the thickest interphase. Furthermore, both models show that the thinnest and the longest CNT as well as the thickest interphase and the least CNT waviness cause the highest conductivity in PCNT, because they positively contribute to the formation and properties of the conductive network.

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Section: Theoretical Analysismentioning

confidence: 96%

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Zare

Rhee

2020

Polymers

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“…In addition, the interphase thickness changes the percolation threshold of CNT in PCNT as:

φ_{p} = \frac{π R^{2} l}{\frac{32}{3} π {(R + t)}^{3} ([], 1 + \frac{3}{4} ((), \frac{l_{eff}}{R + t}) + \frac{3}{32} {(\frac{l_{eff}}{R + t})}^{2})}

…”

Section: Theoretical Expressionsmentioning

confidence: 99%

“…Accordingly, CNT conductivity cannot control the excluded volume of CNT not playing a role in the percolation threshold. The earlier studies reported that the percolation threshold depends on the CNT dimensions and interphase thickness [32,40] . Based on these evidences, Equation 19 reasonably shows the roles of "l" and "σ f " parameters in percolation threshold.…”

Section: Parametric Studiesmentioning

confidence: 99%

Effect of conductivity transportation from carbon nanotubes (CNT) to polymer matrix surrounding CNT on the electrical conductivity of nanocomposites

2019

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In this article, the interphase thickness in polymer carbon nanotubes (CNTs) nanocomposites (PCNT) is correlated to CNT radius and the extent of conductivity transportation from CNT to polymer matrix surrounding the CNT (K). In addition, CNT properties and “K” are applied to suggest the simple equations for percolation threshold and the fraction of networked CNT. A simple model is developed to predict the conductivity of PCNT assuming CNT size, “K” and tunneling resistance. The impacts of different parameters on the interphase thickness, percolation threshold, the fraction of networked CNT, and the conductivity of nanocomposites are studied and many experimental results are used to confirm the predictions. Thin and large CNT as well as high “K” cause low percolation threshold, large conductive networks and desirable conductivity in nanocomposites. Moreover, high tunneling resistivity and large tunneling distance negatively affect the conductivity, but the exceptional CNT conductivity is ineffective. The reasonable roles of all parameters in the predicted conductivity and the fine agreement between predictions and experimental results confirm the developed model.

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“…The conductivity of PCNT is found after the filler percolation onset in which the nanofiller forms a network, which causes charge transport [23][24][25]. In addition to percolation threshold for conductivity in nanocomposites, an abrupt improvement of modulus/stiffness was found called a mechanical percolation [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Connecting Effectiveness of the Interphase Zone on the Tensile Properties of Carbon Nanotubes (CNT) Reinforced Nanocomposite

Zare

Rhee

2020

Polymers

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The establishment of interphase region around nanoparticles accelerates the percolating of carbon nanotubes (CNT) in polymer nanocomposites reinforced with CNT (PCNT), due to the linking productivity of interphase district before the physical connecting of nanoparticles. Therefore, the interphase is an important character in the networks of CNT in PCNT. Here, a simulation study is presented to investigate the interphase connection in the mechanical possessions of PCNT including tensile modulus and strength. A number of models comprising Takayanagi, Ouali, Pukanszky and Callister are developed by the assumption of an interphase district in the CNT excluded volume. The advanced models depict the optimistic influences of reedy and lengthy CNT besides dense interphase on the stiffness and tensile power of nanocomposites. The Pukanszky calculations depict that the interphase strength plays a more noteworthy role in the nanocomposites strength compared to the CNT length.

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The effective conductivity of polymer carbon nanotubes (CNT) nanocomposites

Cited by 77 publications

References 46 publications

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Calculation of the Electrical Conductivity of Polymer Nanocomposites Assuming the Interphase Layer Surrounding Carbon Nanotubes

Effect of conductivity transportation from carbon nanotubes (CNT) to polymer matrix surrounding CNT on the electrical conductivity of nanocomposites

Analysis of the Connecting Effectiveness of the Interphase Zone on the Tensile Properties of Carbon Nanotubes (CNT) Reinforced Nanocomposite

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