Ionic behavior of dc conduction in polyetheretherketone

Kim, E.J.; Ohki, Yoshimichi

doi:10.1109/94.368682

Cited by 22 publications

(9 citation statements)

References 18 publications

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“…The Differential scanning Callorimetery (DSC) thermographs of PEEK [50 μm thickness] studied by H.M. Li et al [19] also confirmed occurrence of glass transition temperature (T g ) around 145°C. Moreover DSC spectra for PEEK confirmed the glass transition appears at 145°C with a scan rate of 10°C / min and at 144°C with a rate of 2°C / min [14].…”

Section: Resultsmentioning

confidence: 66%

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Dielectric behavior of polyetheretherketone (PEEK) using TSDC technique

Kalia

Sharma

2012

J Polym Res

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The dielectric relaxation behavior of Polyetheretherketone (PEEK) has been investigated by using thermally stimulated discharge current (TSDC) technique. The dependence of TSDC characteristics of PEEK on poling temperature (T P ) [50-200°C], poling field (E P ) [200-500 kV/cm], storage time (t S ) [2-120 hrs] and various thicknesses 25 μm, 50 μm and 75 μm have been investigated in the temperature range [60-230°C]. The TSDC spectra shows a prominent maxima around glass transition temperature (T g ) i.e. at 143°C named as α-peak and the other peak is observed around 200°C named as β-peak. The α-dipolar relaxation is taking place because of the movement of ketone (>C 00) dipoles linked to the main chain. The β-peak is attributed to the space charges. It is observed that the magnitude of α-peak increases with the increase in poling field. The peak current and area under the α-peaks are found to be diminished with the increase of storage time (t s ) for electrets. The amplitude of α-peak decreases with the increase in thickness. The activation energies for PEEK sample at different conditions in the present work are found to be 0.38 eV-1.70 eV. The values of activation energy (U) and preexponential factor (C o ) for α-relaxation are determined using Bucci plot method and support the nature of the relaxations.

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Section: Resultsmentioning

confidence: 66%

“…[8]. However, only a few reports have been published on electrical and dielectric properties of PEEK [1,3,[9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Dielectric behavior of polyetheretherketone (PEEK) using TSDC technique

Kalia

Sharma

2012

J Polym Res

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“…When the composite system is different, hopping could also occur in the middle of the band gap near the Fermi level, or through the organic conduction band tail for electron hopping if the fillers are n-type semiconductors, metals or carbon black. Finally, an ionic hopping contribution, which has been claimed for some organic dielectric or dielectric composites, cannot be rigorous ruled out in this study [35,38], as it also happens via hopping transfer.…”

Section: Discussionmentioning

confidence: 81%

“…Among the proposed mechanisms, hopping of charge carriers across spatially, as well as energetically discrete, localized states has been widely reported to be a primary charge transport mechanism in many amorphous semiconductors, dielectrics or composites [32][33][34][35][36][37][38]. In such cases, carrier hopping usually takes place between neighboring sites of small separation, called nearestneighbor hopping, or between sites of close energy level but slightly larger separation, called variable range hopping, which is more favorable at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms leading to nonlinear electrical response of a nano p-SiC/silicone rubber composite

Wang

Nelson

Schadler

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

105

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It is well known that hopping of charge carriers via spatially and energetically distributed localized states is a primary transport mechanism in many disordered semiconductors and polymeric dielectrics. In this contribution, the nonlinear I-V physics of a 25vol% 50nm p-SiC/silicone rubber composite for high voltage field grading application was investigated, and a composite bulk hopping mechanism proposed. It is hypothesized that nearest-neighbor hole hopping occurs through thin rubbery layers between the SiC particles, and is the mechanism governing the nonlinear electric response of SiC/silicone rubber nanocomposites.

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“…The RAF consist in 'amorphous' material highly constrained due to its proximity with crystalline phase. The temperature dependence of the amorphous phase molecular mobility has been already characterized by DMA [13][14][15][16][17], dielectric spectroscopy [4,6,[18][19][20], and TSC [21][22][23][24][25]. Two subglass relaxations have been observed by dielectric spectroscopy and tentatively interpreted in terms of molecular motions.…”

Section: Introductionmentioning

confidence: 99%

Dielectric relaxations in PEEK by combined dynamic dielectric spectroscopy and thermally stimulated current

Leonardi

Dantras

Dandurand

et al. 2012

J Therm Anal Calorim

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The molecular dynamics of a quenched poly (ether ether ketone) (PEEK) was studied over a broad frequency range from 10-3 to 10 6 Hz by combining dynamic dielectric spectroscopy (DDS) and thermo-stimulated current (TSC) analysis. The dielectric relaxation losses e 00 KK has been determined from the real part e 0 T(x) thanks to Kramers-Kronig transform. In this way, conduction and relaxation processes can be analyzed independently. Two secondary dipolar relaxations, the c and the b modes, corresponding to non-cooperative localized molecular mobility have been pointed out. The main a relaxation appeared close to the glass transition temperature as determined by DSC; it has been attributed to the delocalized cooperative mobility of the free amorphous phase. The relaxation times of dielectric relaxations determined with TSC at low frequency converge with relaxation times extracted from DDS at high frequency. This correlation emphasized continuity of mobility kinetics between vitreous and liquid state. The dielectric spectroscopy exhibits the a c relaxation, near 443 K, which has been associated with the rigid amorphous phase confined by crystallites. This present experiment demonstrates coherence of the dynamics of the PEEK heterogeneous amorphous phase between glassy and liquid state and significantly improve the knowledge of molecular/dynamic structure relationships.

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Ionic behavior of dc conduction in polyetheretherketone

Cited by 22 publications

References 18 publications

Dielectric behavior of polyetheretherketone (PEEK) using TSDC technique

Dielectric behavior of polyetheretherketone (PEEK) using TSDC technique

Mechanisms leading to nonlinear electrical response of a nano p-SiC/silicone rubber composite

Dielectric relaxations in PEEK by combined dynamic dielectric spectroscopy and thermally stimulated current

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