Electroluminescence from polyolefins subjected to a homogeneous ac field

Jönsson, Jakob; Rånby, Bengt; Mary, D.; Laurent, Christian; Mayoux, C.

doi:10.1109/94.368685

Cited by 35 publications

(14 citation statements)

References 14 publications

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“…Typical configuration used to detect EL from polymer films under a uniform electric field. From [54].…”

Section: Diverging Fieldmentioning

confidence: 97%

“…The electric field at the periphery of the conducting layers is not controlled, and therefore the edges are covered with silicone rubber to prevent light detection from this zone. Moreover, a plastic cover is used to detect only the light coming from the center of the film [54]. The main advantage of using samples with a uniform field configuration is that many different types of polymers can be studied without reference to their molding ability.…”

Section: Uniform Fieldmentioning

confidence: 99%

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Optical emission due to space charge effects in electrically stressed polymers

Laurent

Massines

Mayoux

1997

IEEE Trans. Dielect. Electr. Insul.

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109

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Electrical wear-out and dielectric breakdown of insulating polymers involve dissipation to the lattice of the energy of mobile or trapped space charges. Optical emissions are proof of such energy releases and can be used to define the onset of electrical aging and to investigate the dissipation mechanisms. They also could provide a basis for monitoring the degradation rate. The situation considered is that of a material subjected to a voltage stress in the absence of any gas discharge, i.e., the light does not originate from a gaseous plasma. Depending on the type of material and experimental configuration, light emission can be due to excited states of the solid itself and/or of dissolved or adsorbed gas molecules. The polymers of concern are practical materials used as electrical insulation in cables, capacitors, motors, transformers, etc. This review attempts to bring together the published data on electroluminescence of insulating polymers and to discuss the relationship between light emission, space charge, and polymer degradation.

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“…Typical configuration used to detect EL from polymer films under a uniform electric field. From [54].…”

Section: Diverging Fieldmentioning

confidence: 97%

Section: Uniform Fieldmentioning

confidence: 99%

Optical emission due to space charge effects in electrically stressed polymers

Laurent

Massines

Mayoux

1997

IEEE Trans. Dielect. Electr. Insul.

Self Cite

109

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“…Thus, more recently 31,32) it was chosen to use thin polymeric films, 10 to 100 lm thick, in a flat electrode geometry. This arrangement gives a larger emitting volume and therefore, more light to the detector.…”

Section: Electrical Treeing Initiationmentioning

confidence: 99%

Studies on the aging processes of polymers in electrical systems

Mayoux¹

1998

Angew. Makromol. Chem.

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“…Above -1.5 x lo7 V/m, conductivity is non-ohmic [37], which suggests strong charge injection. Finally, electroluminescence was detected in PE subjected (between plane electrodes) to fields 2 1.5 to 1.8 x lo7 V/m [38].…”

Section: Aging Of Polymer Insulation Above the Critical Fieldmentioning

confidence: 99%

A molecular model to evaluate the impact of aging on space charges in polymer dielectrics

Crine

1997

IEEE Trans. Dielect. Electr. Insul.

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The understanding of space charge effects depends largely on how concurrent phenomena, such as thermal and electrical aging are understood. A model describing thermal and environmental aging of dielectric polymers is discussed. The model essentially is based on the rate theory associated with the name of Eyring. One basic feature of the model is that the proper energy term is a free energy of activation AG, which implies that the entropy change of the process cannot be neglected. Several examples are given to show that AG is related directly to some physical or chemical parameter involved in thermal or environmental aging. A model describing the mechanical aging of polymers is also discussed. It is shown that submicrocavities can be generated by mechanical stresses above a given critical level, the value of whiclh depends on the energy of cohesion of the polymer. The size of these defects are in good agreeiment with the Griffith criterion. Finally, the same model adapted to electrical stresses is shown to describe the electrical aging of polyethylene. It predicts that the most deleterious influence of aging is above a given critical field (similar to the critical stress in mechanical aging), where [submicrocavities are induced by the electromechanical forces associated with the ac field. Elelctrons can then move without scattering within the submicrocavities and this may lead to furtlher degradation. The relations between thermal, mechanical and electrical aging and space charges in polymers are addressed briefly and domains requiring more work are mentioned.

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Electroluminescence from polyolefins subjected to a homogeneous ac field

Cited by 35 publications

References 14 publications

Optical emission due to space charge effects in electrically stressed polymers

Optical emission due to space charge effects in electrically stressed polymers

Studies on the aging processes of polymers in electrical systems

A molecular model to evaluate the impact of aging on space charges in polymer dielectrics

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