Temperature and time dependence of conductive network formation: Dynamic percolation and percolation time

Zhang, Cheng; Wang, Ping; Ma, Chao; Wu, Guozhang; Sumita, Masao

doi:10.1016/j.polymer.2005.11.053

Cited by 129 publications

(85 citation statements)

References 40 publications

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“…This effect is attributed to a dynamic percolation and is explained by the build-up of new conductive pathways due to the thermal motion and the aggregation of the carbon black primary aggregates [10,13]. Similar experimental results were obtained for polycarbonate filled 10 with carbon nanotubes [8].…”

Section: Resultssupporting

confidence: 75%

Shear induced electrical behaviour of conductive polymer composites

Starý¹,

Krückel²,

Schubert³

2013

AIP Conference Proceedings

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Abstract. The time-dependent electrical resistance of polymethylmethacrylate containing carbon black was measured under oscillatory shear in the molten state. The electrical signal was oscillating exactly at the doubled frequency of the oscillatory shear deformation. Moreover, the experimental results gave a hint to the development of conductive structures in polymer melts under shear deformation. It was shown that the flow induced destruction of conductive paths dominates over the flow induced build-up in the beginning of the shear deformations. However, for longer times both competitive effects reach a dynamic equilibrium and only the thermally induced build-up of pathways influences the changes in the composite resistance during the shear. Furthermore, the oscillating electrical response depends clearly on the deformation amplitude applied. A simple physical model describing the behaviour of conductive pathways under shear deformation was derived and utilized for the description of the experimental data.

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Section: Resultssupporting

confidence: 75%

Shear induced electrical behaviour of conductive polymer composites

Starý¹,

Krückel²,

Schubert³

2013

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…This resistivity is comparable to that (11.0 TΩ⋅m) of the composite film fabricated without application of an electric field. A conducting polymer composite requires a resistivity of at least ∼0.1 MΩ⋅m [40,41], whereas the electrical conductivity of the present composites is in the range of an insulator. However, the electrical conductivity varied over several orders of magnitude and is highly sensitive to the applied electric field and the CNT content ( Figure 6).…”

Section: Resultsmentioning

confidence: 99%

Densely Packed Linear Assembles of Carbon Nanotube Bundles in Polysiloxane‐Based Nanocomposite Films

Cho

Huynh

Nakayama

et al. 2013

Journal of Nanomaterials

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Linear assemblies of carbon nanotubes (LACNTs) were fabricated and controlled in polysiloxane-based nanocomposite films and the effects of the LACNTs on the thermal and electrical properties of the films were investigated. CNTs were dispersed by mechanical stirring and sonication in a prepolymer of polysiloxane. Homogeneous suspensions were cast on polyamide spacers and oriented by linear-assembly by applying DC and switching DC electric fields before the mixture became cross-linked. Densely packed LACNTs that fixed the composite film surfaces were fabricated with various structures and thicknesses that depended on the DC and switching DC conditions. Polymer nanocomposites with different LACNT densities exhibited enhanced thermal and electrical conductivities and high optical transmittances. They are considered promising structural materials for electronic sectors in automotive and aerospace applications.

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“…In the previous work, 19 a thermodynamic percolation model was proposed to predict the percolation time of the HDPE/iPP/VGCF system. The relationship between t p and u is given as follows:…”

Section: Resultsmentioning

confidence: 99%

“…Tai et al 23,24 developed an approach to obtain a one-dimensional conductive composite based on the dynamic percolation and electric-field induced alignment of CB particles in low-density polyethylene (LDPE) matrix. In the previous work, 19 a modified thermodynamic percolation model was also deduced to predict the percolation time for vapor-grown carbon fiber (VGCF) filled high-density polyethylene (HDPE)/isotactic polypropylene (iPP) blends.…”

Section: Introductionmentioning

confidence: 99%

Conductive network formation and electrical properties of poly(vinylidene fluoride)/multiwalled carbon nanotube composites: Percolation and dynamic percolation

Zhang

Zhu

Ouyang

et al. 2009

J of Applied Polymer Sci

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Conductive network formation and its dynamic process for multiwalled carbon nanotubes (MWNTs) and carboxyl-tethered MWNT (MWNT-COOH) filled poly(vinylidene fluoride)(PVDF) systems were investigated. Based on real-time tracing the variation of electrical resistivity of systems with isothermal treatment time, the conductive network formation was evaluated. It was found that the conductive network formation was temperature and time dependent. The percolation time, characterized at a certain annealing time where the electrical resistivity started to decrease drastically, decreased with the increase of the filler concentration or the annealing temperature. However, the values of the percolation time and the activation energy of conductive network formation for the PVDF/MWNT-COOH system were higher than those of the PVDF/MWNT system, indicating that the interaction between MWNTs and PVDF molecules played an important role in the conductive network formation of the composites. Furthermore, a modified thermodynamic percolation model was proposed to predict the percolation time of PVDF/MWNT composites. It was found that the calculated results fit the experimental data very well.

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Temperature and time dependence of conductive network formation: Dynamic percolation and percolation time

Cited by 129 publications

References 40 publications

Shear induced electrical behaviour of conductive polymer composites

Shear induced electrical behaviour of conductive polymer composites

Densely Packed Linear Assembles of Carbon Nanotube Bundles in Polysiloxane‐Based Nanocomposite Films

Conductive network formation and electrical properties of poly(vinylidene fluoride)/multiwalled carbon nanotube composites: Percolation and dynamic percolation

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