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Electronic structure of defected polyethylene for Schottky emission

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#Electricity Network #Industrial sector #Technologies and Components

Publications - ISI Article

Electronic structure of defected polyethylene for Schottky emission

These must show electronic states slightly lower than the conduction band. Furthermore, these sites must be able to act as traps for excess negative charge.

Polypropylene is one of the most widely used materials in the electrical power industry. In particular, it is used to insulate high voltage cables. If subjected to stress associated with AC power supply, this material tends to age especially in relation to treeing. This phenomenon causes some internal defects in the insulation to enlarge, leading to the formation of cavities. Treeing is capable of burrowing into the polymer matrix leading to eventual failure of the component. Each discharge is generated by electronic emission from the surface that divides the gas from the solid. The Schottky effect is believed to be the primary mechanism causing electron emission. Our DFT analysis suggests that emission is very difficult when the surface is neutral. The DOS analysis also found that the release is linked to chemical defects. These must show electronic states slightly lower than the conduction band. Furthermore, these sites must be able to act as traps for excess negative charge.

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Rif.RSE​

20006242

Destination​

Materials Chemistry and Physics, Vol. 263, 124268

Publication Date

15 April 2021

Authors​

G. Buccella (Politecnico di Milano), D. Ceresoli (CNR-SCITEC), A. Villa, L. Barbieri, R. Malgesini (RSE S.p.A.)

Publication Type

ISI Article

Projects

Components and materials for safety and resilience (Mat4Res)

Target​

Industrial world

Related tags

#Electricity Network #Industrial sector #Technologies and Components

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