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

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 404 ◽  
Author(s):  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Electrical Conductivity ◽  
Polymer Nanocomposites ◽  
Volume Fraction ◽  
Tunneling Effect ◽  
Interphase Layer ◽  
Conductive Network ◽  
Effective Volume ◽  
Effective Volume Fraction ◽  
Filler Fraction ◽  
High Fraction

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.

Analysis of Clustering and Interphase Region Effects on the Electrical Conductivity of Carbon Nanotube-Polymer Nanocomposites via Computational Micromechanics

2008 ◽  
Author(s):  
Gary D. Seidel ◽  
Kelli L. Boehringer ◽  
Dimitris C. Lagoudas
Keyword(s):  
Electrical Conductivity ◽  
Polymer Nanocomposites ◽  
Effective Conductivity ◽  
Interphase Layer ◽  
Finite Element Software ◽  
Interphase Region ◽  
Effective Electrical Conductivity ◽  
Wide Range ◽  
Electrical Conductivities ◽  
Computational Micromechanics

In the present work, computational micromechanics techniques are applied towards predicting the effective electrical conductivities of polymer nanocomposites containing aligned bundles of SWCNTs at wide range of volume fractions. Periodic arrangements of well-dispersed and clustered/bundled SWCNTs are studied using the commercially available finite element software COMSOL Multiphysics 3.4. The volume averaged electric field and electric flux obtained are used to calculate the effective electrical conductivity of nanocomposites in both cases, therefore indicating the influence of clustering on the effective electrical conductivity. In addition, the influence of the presence of an interphase region on the effective electrical conductivity is considered in a parametric study in terms of both interphase thickness and conductivity for both the well dispersed case and for the clustered arrangements. Comparing the well-dispersed case with an interphase layer to the same arrangement without the interphase layer allows for the assessment of the influence of the interphase layer on the effective electrical conductivities, while similar comparisons for the clustered arrangements yield information about the combined effects of clustering and interphase regions. Initial results indicate that there is very little influence of the interphase layer on the effective conductivity prior to what is identified as the interphase percolation concentration, and that there is an appreciable combined effect of clustering in the presence of interphase regions which leads to increases in conductivity larger than the sum of the two effects independently.

Molecular dynamics simulation of the electrical conductive network formation of polymer nanocomposites by utilizing diblock copolymer-mediated nanoparticles

Soft Matter ◽  
2019 ◽  
Vol 15 (31) ◽  
pp. 6331-6339 ◽  
Author(s):  
Yangyang Gao ◽  
Xiaohui Duan ◽  
Peng Jiang ◽  
Huan Zhang ◽  
Jun Liu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Electrical Conductivity ◽  
Molecular Dynamics Simulation ◽  
Polymer Nanocomposites ◽  
Diblock Copolymer ◽  
Network Formation ◽  
Dynamics Simulation ◽  
Conductive Network ◽  
High Electrical Conductivity ◽  
Simple Method

It is a simple method to utilize diblock copolymer-mediated nanoparticles to control the conductive network formation, which can help to design the nanocomposites with the high electrical conductivity, especially the anisotropy.

scholarly journals Percolation analysis of the electrical conductive network in a polymer nanocomposite by nanorod functionalization

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36324-36333 ◽  
Author(s):  
Ruibin Ma ◽  
Guangyao Mu ◽  
Huan Zhang ◽  
Jun Liu ◽  
Yangyang Gao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Polymer Nanocomposites ◽  
Polymer Nanocomposite ◽  
Conductive Network ◽  
Effective Strategy ◽  
Chemical Functionalization ◽  
The Matrix

Chemical functionalization of nanofillers is an effective strategy to benefit the formation of the conductive network in the matrix which can enhance the electrical conductivity of polymer nanocomposites (PNCs).

Synergistic effect in improving the electrical conductivity in polymer nanocomposites by mixing spherical and rod-shaped fillers

Soft Matter ◽  
2020 ◽  
Vol 16 (46) ◽  
pp. 10454-10462
Author(s):  
Fan Qu ◽  
Wei Sun ◽  
Bin Li ◽  
Fanzhu Li ◽  
Yangyang Gao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Synergistic Effect ◽  
Polymer Nanocomposites ◽  
Volume Fraction ◽  
Tunneling Distance

φNR0 and φNS0 are volume fraction of nanorods and nanospheres in the system respectively. TD = The NR–NS tunneling distance.

scholarly journals Study on the Effects of the Interphase Region on the Network Properties in Polymer Carbon Nanotube Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 182 ◽  
Author(s):  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Percolation Threshold ◽  
Polymer Nanocomposites ◽  
Volume Fraction ◽  
Excluded Volume ◽  
Positive Role ◽  
Interphase Region ◽  
Network Properties ◽  
High Fraction ◽  
Filler Network

The interphase region around nanoparticles changes the percolation threshold of long and thin nanoparticles, such as carbon nanotubes (CNT) in polymer nanocomposites. In this paper, the effects of the interphase region on the percolation threshold of nanoparticles and the network fraction are studied. New percolation threshold (φP) is defined by the role of the interphase in the excluded volume of nanoparticles (Vex). Moreover, the influences of filler and interphase size on the percolation volume fraction, the fraction of nanoparticles in the network as well as the volume fraction and relative density of the filler network are investigated. The least ranges of “φP” are obtained by thin and long CNT. Similarly, a thick interphase increases the “Vex” parameter, which causes a positive role in the percolation occurrence. Also, thin CNT and a thick interphase cause the high fraction of the filler network in the nanocomposites.

Reduction in Viscosity of an SBR Compound Caused by Mastication and Disagglomeration during Mixing

1994 ◽  
Vol 67 (4) ◽  
pp. 700-715 ◽  
Author(s):  
J. Clarke ◽  
P. K. Freakley
Keyword(s):  
Carbon Black ◽  
Strain Rate ◽  
Rheological Behavior ◽  
Dibutyl Phthalate ◽  
Volume Fraction ◽  
Relative Viscosity ◽  
Mixing Times ◽  
Effective Volume ◽  
Effective Volume Fraction

Abstract It would be advantageous to determine the causes of changes in rheological behavior of a compound during mixing, so that mixing times and conditions could be optimized to give the desired processing behavior and properties of the final product. The causes of changes in viscosity during mixing of a compound containing only elastomer and carbon black were investigated by examining concurrent changes in viscosity of the gum, density of the compound and degree of carbon-black disagglomeration. The reduction in viscosity occurring during mixing could be attributed to mastication of the elastomer and disagglomeration of the carbon black. The effect of mastication could be removed by calculating values of relative viscosity, using the viscosity of the gum treated in a similar way to the compound and with an allowance being made for strain-rate amplification. The decrease in relative viscosity of the compound with increased mixing was attributed to a reduction in effective volume fraction of filler caused by immobilized rubber being released as carbon black agglomerates were broken down. The dibutyl phthalate absorption (DBPA) value of the carbon black gave a good indication of the amount of immobilized rubber present in an agglomerate.

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