Electrical conduction current in polytetrafluoroethylene

Sussi, M.A.; Raju, Gorur Govinda

doi:10.1109/ceidp.1990.201342

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…Moreover, many works [4] have revealed the accumulation of space charge in the insulator, leading to local strengthening of the electric field compared to the geometric field. The same kind of conclusion is encountered in the literature for materials such as polyimide (PI) or polytetrafluoroethylene (PTFE) [5][6][7], that are materials also used as insulation in domains such as microelectronics or space applications.…”

Section: Introductionmentioning

confidence: 59%

“…In the literature, the electrical properties of PTFE were particularly investigated with current measurements, although it is not clear if the material under study is the same PTFE as the one measured in this paper. As an example, for PTFE samples of 130 µm thickness metallized with silver electrodes, Sussi et al [6] measured the current as a function of electric fields, for fields up to 25 kV/mm and temperatures ranging from 40 up to 200°C. They observed three different regions in the J-E behaviour, with an ohmic regime measured below an applied field value of 2 kV/mm.…”

Section: Current Measurements On Ptfe Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Current Measurements in High Performance Polymers Used in Aeronautic Cables

Diaw

Roy

Teyssèdre

et al. 2020

IEEE Trans. Dielect. Electr. Insul.

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Section: Introductionmentioning

confidence: 59%

Section: Current Measurements On Ptfe Samplesmentioning

confidence: 99%

Current Measurements in High Performance Polymers Used in Aeronautic Cables

Diaw

Roy

Teyssèdre

et al. 2020

IEEE Trans. Dielect. Electr. Insul.

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“…In particular, the Schottky field-assisted thermionic emission at the electrode-polymer interface is given by [33]…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…where β PF = 2β S = 2 e 3 /4πε 0 ε r = e 3 /π ε 0 ε r is the Poole-Frenkel coefficient, which is double that of the Schottky model, ϕ PF is the potential barrier associated with a trap, B is a constant and the other symbols are the same as in the Schottky model [33]. Finally, the hopping mechanism is described by…”

Section: Electrical Propertiesmentioning

confidence: 99%

Dependence of electrical properties of polypropylene isomers on morphology and chain conformation

Guadagno¹,

Raimondo²,

Vittoria³

et al. 2009

J. Phys. D: Appl. Phys.

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The electrical properties of polypropylene isomers were correlated with the morphology and chain conformation of differently obtained isotactic (iPP) and syndiotactic (sPP) samples. In the case of iPP, a crystallized and a smectic sample were prepared, whereas for sPP two crystalline helical samples and a mesophase with the chains in trans-planar conformation were considered. The phase composition was obtained for all the samples comparing x-ray diffractograms and transport properties of vapours, which give the crystallinity and the amorphous fraction, respectively. The fraction of mesophase was obtained by the difference of the previous values. The study of the morphology evidenced similarities and differences among the samples, which were discussed and correlated with the phase composition. The electrical conductivity was measured for all the samples, and the syndiotactic isomer showed the lowest value as well as a dependence on the structure. In contrast, the isotactic isomer showed the same behaviour for either polymorph. Based on the structural and electrical results, a phenomenological explanation of the conduction mechanisms taking place in the different forms has been proposed. In particular, the current in the iPP seems to be controlled by Schottky emission, i.e. by field-assisted thermo-ionic injection of carriers from the electrode into the polymer, whereas for the sPP more than one mechanism is likely to be effective, although the ionic transport appears as the predominant one. The experimental data confirm a different behaviour of the ionic conduction properties for the different polymorphs, highlighting the greater insulating characteristics of the mesomorphic structure of the syndiotactic isomer.

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“…Studies show that, in energy transmission in terrestrial HVDC networks [3], cables insulation materials can accumulate space charge, and macroscopic models are used to predict electric field distribution [4,5]. In fact, with HVDC systems, electric field is driven by electrical conductivity, which is usually dependent on temperature and electric field, even for materials used in aeronautic domain [6][7][8]. In the perspective of more electric aircraft, insulating materials behaviour has been investigated by performing experimental characterization on two materials used as insulation in aeronautic cables: Polytetrafluoroethylene and Polyimide (PTFE) and Kapton FN [9].…”

Section: Introductionmentioning

confidence: 99%

Electric Field and Current Conduction Modelling in Bi-layers Insulations HVDC Aeronautic Cables

Diaw

Roy

Teyssèdre

et al. 2020

2020 IEEE 3rd International Conference on Dielectrics (ICD)

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For decades, electrical energy network in aircrafts was based on relatively low voltage (mainly 115V ac and 28V dc), providing the power to the different energy functions of the aircraft. Great strides have been made in the new aircraft generations, notably the A380 and the Boeing 787, with an increase of the aircraft size, and with the input of electrical energy in replacement of certain hydraulic or pneumatic actuations. Today, there is a tendency to replace HVAC network with HVDC (+/-270 V dc, 540 V dc and higher in the future) network in order to benefit from these many advantages. This increase of the electrical energy pushes the transmission cables to their limits and leads to questions about the impact of these new constraints on the aeronautic cables insulation. This article presents a macroscopic model and comparison between simulation results and measurements made on bi-layer materials used in actual aeronautic cable insulation. The electric field distribution within materials and kinetic of interfacial charges build-up are analyzed.

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Electrical conduction current in polytetrafluoroethylene

Cited by 7 publications

References 4 publications

Current Measurements in High Performance Polymers Used in Aeronautic Cables

Current Measurements in High Performance Polymers Used in Aeronautic Cables

Dependence of electrical properties of polypropylene isomers on morphology and chain conformation

Electric Field and Current Conduction Modelling in Bi-layers Insulations HVDC Aeronautic Cables

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