Electrical conduction of LDPE at moderate fields

Neagu, Rodica M.; Marat-Mendes, J.N.; Neagu, Eugen R.

doi:10.1109/ise.2002.1042958

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…4, the barrier of releasing electrons from the electrode, Φ, for low-density polyethylene is 1.685eV , which seems to be in agreement with the literature. 26,27 Therefore, the cross-section , which is about 1.5 × 10 −5 eV per monomer unit. However, this energy is insufficient to disassociate individual monomer units whose strength is of the order of 3.5 − 4 eV .…”

Section: Resultsmentioning

confidence: 99%

The electro-mechanical effect from charge dynamics on polymeric insulation lifetime

2015

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For polymeric material used as electrical insulation, the presence of space charges could be the consequence of material degradations that are thermally activated but increased by the application of an electric field. The dynamics of space charge, therefore, can be potentially used to characterize the material. In this direction, a new aging model in which parameters have clear physical meanings has been developed and applied to the material to extrapolate the lifetime. The kinetic equation has been established based on charge trapping and detrapping of the injected charge from the electrodes. The local electromechanical energy stored in the region surrounding the trap is able to reduce the trap-depth with a value related to the electric field. At a level where the internal electric field exceeds the detrapping field in the material, an electron can be efficiently detrapped and the released energy from detrapping process can cause a weak bond or chain scission i.e. material degradation. The model has been applied to the electro-thermally aged low density polyethylene film samples, showing well fitted result, as well as interesting relationships between parameter estimates and insulation morphology.

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Section: Resultsmentioning

confidence: 99%

The electro-mechanical effect from charge dynamics on polymeric insulation lifetime

2015

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“…For long measuring time the behavior is dominated by the space charge stored in the sample, which controls charge injection/extraction and charge trapping and detrapping through the sample. There is a clear distinction between the SCLC and the new observed mechanism of space-charge-controlled conductivity (SCCC) [14,15]. Electrons are given injected into the polymer at the cathode and they remain very close to the cathode for the conditions.…”

Section: Resultsmentioning

confidence: 99%

Electrical Charge Injection/Ejection and Transport at Moderate Fields in Low-Density Polyethylene

Neagu

Neagu²,

Marat-Mendes

2004

MSF

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The electrical conduction of LDPE was investigated in the temperature range from 20 to 95 °C and for applied fields up to 25 MV m -1 , using isothermal charging and discharging currents measurements. The conduction process is strongly influenced by the charge stored in the sample. The apparent activation energy W is about 0.77 eV. It changes with the isochronal measuring time and at low fields with temperature. As the applied field or charging time increase the space charge stored in the sample increases and implicitly W decreases. The results for long times (days) attest a new conduction mechanism: the space-charge-controlled conductivity.

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