Prediction of the DC electrical conductivity of carbon black filled polymer composites

Kassim, Syara; Achour, M. E.; Costa, L.C.; Lahjomri, F.

doi:10.1007/s00289-015-1421-5

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…When the concentration reaches the critical percolating threshold, the conductivity exhibits a sharp increase, attaining a value almost constant which characterizes the conducting charges behavior. The conductivity versus concentration can be expressed theoretically by the following relation :

σ = σ_{o} {true(ϕ_{f} - ϕ_{p} true)}^{t} for ϕ_{f} > ϕ_{p}

…”

Section: Percolation and Interphase Theoriesmentioning

confidence: 99%

“…Where σ f and σ m are the conductivities of the filler and host phases, respectively. The exponent t characterizes the AC and DC conductivities, and its theoretical value is t = 2 and a constant A is described in terms of the percolation threshold, ϕ p , and

A = (1 - ϕ_{p}) / ϕ_{p}

. Because this model does not fit accurately the experimental data, a modification was introduced, taking into account the volume, V i , and concentration, ϕ i , of the interphase region.…”

Section: Percolation and Interphase Theoriesmentioning

confidence: 99%

“…This is not true when the environment contrasts significantly . The generalized effective medium model (GEM) developed by McLachlan is a direct combination of the effective medium theories with percolation theory, and was used with different approximations, in the study of composite systems . The obtained results indicate that the GEM gives a good agreement with experimental data but the problem is that the physical parameters are not universal and depend on the composite materials.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of filler/matrix interphase effects on AC and DC electrical properties of carbon reinforced polymer composites

et al. 2017

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This study predicts the effect of the conducting filler/ insulating matrix interphase on the electrical properties of two series of percolated systems, differing from the type of carbon black particles mixed in an aminecured epoxy matrix, diglycidylic ether of bisphenol F. To take into account the interactions between the conducting filler and the matrix, as well as filler-filler overlapping, we introduce three parameters, characteristic of the interphase zone, such as concentration, conductivity and volume, on the generalized effective medium (GEM) model for DC and AC electrical conductivities. These interphase parameters, characterizing the boundary of the shaded zone between the macromolecular chain and the conducting particles, depend on the filler type and concentration. One output of GEM-modified model is that it provides a mean to estimate the volume, concentration and intrinsic conductivity of the interphase in a composite by fitting the experimental data over a broad range of frequency.

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σ = σ_{o} {true(ϕ_{f} - ϕ_{p} true)}^{t} for ϕ_{f} > ϕ_{p}

…”

Section: Percolation and Interphase Theoriesmentioning

confidence: 99%

A = (1 - ϕ_{p}) / ϕ_{p}

. Because this model does not fit accurately the experimental data, a modification was introduced, taking into account the volume, V i , and concentration, ϕ i , of the interphase region.…”

Section: Percolation and Interphase Theoriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prediction of filler/matrix interphase effects on AC and DC electrical properties of carbon reinforced polymer composites

et al. 2017

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“…The electrical conductivity and permittivity and therefore the electrical properties of dielectric polymers filled with conductive filler particles rely on four theoretical assumptions (Bao et al 2012;Davidson 2005;Elhad Kassim et al 2015;Elimat et al 2010;Li et al 2008;Sanli et al 2016;Xia et al 2017), which are also relevant for the change of electrical resistance under stress (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Improving the usability of piezoresistive bond lines in wood by using impedance measurements

2021

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Various studies on wood adhesives filled with conductive fillers for future application to structural monitoring showed a piezoresistive (resistance change with strain) response of the adhesive bond lines that is measurable under direct current. The results also showed a relatively high signal noise with low sensitivity. Using impedance spectroscopy as a measurement technique, the improvements in frequency-dependent piezoresistivity over DC (Direct Current) resistography of multifunctional bonded wood were studied. Beech specimens were bonded by one-component polyurethane prepolymer (1C-PUR) filled with carbon black and tested under shear load. The quality of the piezoresistive properties was described by calculating the signal-to-noise ratio (SNR) of the measured signal. A setup-specific frequency band with optimized SNR between 100 kHz and 1 MHz could be derived from the measurements. Several frequencies showed a signal with higher quality resulting in a higher SNR. Regardless of the variations in impedance spectra for all specimens, this frequency band provided several frequencies with improved signal quality. These frequencies give a more reliable signal with lower noise compared to the signal from DC resistography.

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“…13,14 They have found a lot of applications in the fields of electric and electronics industry. 15 Addition of CB reinforcement in the polyurethane has found to influence the strain recovery properties, especially for those samples with CB content above the percolation threshold. 16 SMPs have wide range of applications in sensor and actuators, 17,18 water-vapor permeability materials, 19 medical devices, 20 and high-performance structures in spacecraft.…”

Section: Introductionmentioning

confidence: 99%

Poly(urethane urea)/polythiophene/carbon black composite

Kausar

2016

Journal of Thermoplastic Composite Materials

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Novel segmented poly(urethane urea) (PUU) was prepared from polycaprolactone triol (soft segment), 4,4′-methylenebis(phenyl isocyanate) (hard segment), and hexamethylenediamine (chain extender). Graphitized carbon black (GCB) was used as filler. Conducting polythiophene (PTh) was infiltrated by chemical oxidative polymerization. The structure, morphology, mechanical properties, electrical conductivity, and voltage-triggered shape memory effect were demonstrated. The unique network morphology was observed by scanning electron microscope due to the generation of interpenetrating polymer networks (IPNs). The formation of PUU-PTh IPNs was due to the interpenetrating PTh and branched polycaprolactone triol structure. The PTh-modified PUU films reinforced with GCB showed 59% increase in tensile strength and 50% enhancement in Young’s modulus relative to the pristine matrix. The presence of PTh and increase in GCB content increased the conductivity of the composites. The conductivity of 10 wt% GCB-loaded PUU/PTh/GCB composite was raised to 0.089 Scm−1, which is higher than the neat PUU (0.91 × 10−2 Scm−1). The surface temperature of PUU/PTh/GCB 10 was also found to increase with time when a higher voltage was applied (40 V). Such a conductivity of composites was enough to show electroactive shape recovery up to 94% (40 V).

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Prediction of the DC electrical conductivity of carbon black filled polymer composites

Cited by 10 publications

References 24 publications

Prediction of filler/matrix interphase effects on AC and DC electrical properties of carbon reinforced polymer composites

Prediction of filler/matrix interphase effects on AC and DC electrical properties of carbon reinforced polymer composites

Improving the usability of piezoresistive bond lines in wood by using impedance measurements

Poly(urethane urea)/polythiophene/carbon black composite

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