Influence of the relaxation of Maxwell-Wagner-Sillars polarization and dc conductivity on the dielectric behaviors of nylon 1010

Lu, Hongbo; Zhang, Xingyuan; Zhang, Hui

doi:10.1063/1.2336494

Cited by 89 publications

(41 citation statements)

References 23 publications

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“…DC which arises due to the ionic or electronic conductivity and the value of the second component (%#)) in the relation strongly depends on the extent of polarization of dipoles (permanent and induced) and accumulated interfacial charges, known as MaxwellWagner-Sillars (MWS) effect [33,34]. Polarization effects based on different physical origins appear at various frequency regions.…”

Section: Ac Conductivitymentioning

confidence: 99%

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

Maiti¹,

Shrivastava²,

Suin³

et al. 2013

Express Polym. Lett.

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Abstract. In this work, polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites were prepared by simple melt mixing at a temperature (~350°C) well above the processing temperature of PC, followed by compression molding, that exhibited percolation threshold as low as of 0.11 wt% and high electrical conductivity of 1.38!10 -3 S·cm -1 at only 0.5 wt% MWCNT loading. Due to the lower interfacial energy between MWCNT and PC, the carbon nanotubes are excellently dispersed and formed continuous conductive network structure throughout the host polymer. AC electrical conductivity and dielectric permittivity of PC/MWCNT nanocomposites were characterized in a broad frequency range, 10 1 -10 7 Hz. Low percolation threshold (p c ) of 0.11 wt% and the critical exponent (t) of ~3.38 was resulted from scaling law equation. The linear plot of log! DC vs. p -1/3 supported the presence of tunneling conduction among MWCNTs. The thermal property and storage modulus of PC were increased with the incorporation of little amount of MWCNTs. Transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM) confirmed the homogeneous dispersion and distribution of MWCNTs throughout the matrix phase.

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Section: Ac Conductivitymentioning

confidence: 99%

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

Maiti¹,

Shrivastava²,

Suin³

et al. 2013

Express Polym. Lett.

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“…The half-width of this α c peak decreases with increasing temperatures due to deviations in the high frequency side of the peak. The electric field relaxation due to the motions of charge carriers is generally well described by the empirical Kohlrausch-Williams-Watts (KWW) function: 27,39 …”

Section: Frequency Temperature Superposition (Fts)mentioning

confidence: 99%

“…Thus, this technique is commonly used for determining charge carrier parameters such as the conductivity relaxation time. [25][26][27] The recorded dielectric data can be expressed in terms of the complex electric modulus (M * ), which is defined as the inverse of the complex permittivity (ε * ):…”

Section: Electric Modulusmentioning

confidence: 99%

Dielectric properties of PVDF thin films doped with 3 wt.% of RCl3 (R = Gd or Er)

2014

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The dielectric permittivity (ɛ′), electric modulus (M″), and ac conductivity (σac) of pure polyvinylidene fluoride (PVDF) and PVDF containing 3 wt.% RCl3 (R = Er or Gd) were measured. The incorporation of 3 wt.% of ErCl3 or GdCl3 within the PVDF matrix is found significantly to increase its ɛ′ and σac. All investigated samples show different relaxation processes within the studied temperature and frequency ranges. The first process is αa-relaxation, which occurs around the glass transition temperature, Tg. The second process is αc-relaxation, which is associated with the molecular motions in the crystalline region of the main polymer chain. Third is the ρ-relaxation which observed for pure PVDF at low temperatures and high frequencies. The frequency dependence of σac shows that the conduction mechanism for pure PVDF and PVDF containing 3 wt.% of RCl3 is correlated barrier hopping (CBH). The binding energy of the carriers was calculated based on the CBH model. Finally, the results obtained in this work are discussed and compared with those for 3 wt.% LaCl3-doped PVDF and similar materials.

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“…Instead, in the electric modulus it appears as peak allowing an easier interpretation of the data. The electric modulus formalism has been used to study the conductivity relaxation in polymers [13,14], glasses [15], crystals [16], ceramics [17] and composites [18,19], among other materials, as epoxy resines [20].…”

Section: Polyetherimide (Pei) Is An Amorphousmentioning

confidence: 99%

Sublinear dispersive conductivity in polyetherimides by the electric modulus formalism

Mudarra

Sellarès

Cañadas

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Dynamic Electrical Analysis shows that the electrical properties of polyetherimide at temperatures above the glass transition are strongly influenced by space charge. We have studied space charge relaxation in two commercial grades of polyetherimide, Ultem 1000 and Ultem 5000, using this technique. The electric modulus formalism has been used to interpret their conductive properties. In both grades of polyetherimide, asymmetric Argand plots are observed, which are related to a sublinear power-law dependency (ω n with n<1) in the real part of the conductivity. This behavior is attributed to correlated hopping. The imaginary part of the electric modulus exhibits a peak in the low frequency range associated with conduction. The modelisation of this peak allows us to obtain the dependence, among other parameters, of the conductivity (σ 0 ), the fractional exponent (n) and the crossover frequency (ω p ) on the temperature. The α relaxation, which appears at higher frequencies, has also to be modeled since it overlaps the conductivity relaxation. The study of the parameters in terms of the temperature allows us to identify the ones that are thermally activated. The difference between the conductivity relaxation time and the Maxwell relaxation time indicates the presence of deep traps. The coupling model points out that the correlation of the ionic motion diminishes with temperature, probably due to increasing disorder due to thermal agitation.

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Influence of the relaxation of Maxwell-Wagner-Sillars polarization and dc conductivity on the dielectric behaviors of nylon 1010

Cited by 89 publications

References 23 publications

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

A strategy for achieving low percolation and high electrical conductivity in melt-blended polycarbonate (PC)/multiwall carbon nanotube (MWCNT) nanocomposites: Electrical and thermo-mechanical properties

Dielectric properties of PVDF thin films doped with 3 wt.% of RCl3 (R = Gd or Er)

Sublinear dispersive conductivity in polyetherimides by the electric modulus formalism

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