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Space charge in thermally aged polyethylene and its electrical performance

Space charge in thermally aged polyethylene and its electrical performance
Space charge in thermally aged polyethylene and its electrical performance

In past decades, significant effort has been made to establish the relationship between ageing and lifetime of electrical insulating materials. Generally, the chemical and physical structure of dielectrics can be affected by ageing, resulting in deterioration of their electrical performance (such as breakdown strength, dielectric loss and conductivity). Recently, the changes in trapping characteristics have been observed in aged polymeric materials. The present research intends to explore the relationship between ageing and space charge dynamics. For this purpose, low-density polyethylene (LDPE) films with different degrees of thermal ageing were prepared. A chemical analysis was performed based on the results from the Fourier-Transform Infrared (FTIR) and differential scanning calorimetry (DSC) techniques. Space charge dynamics were observed using the pulsed electroacoustic (PEA) method. In addition, DC electrical breakdown strength and conductivity were measured. The results indicate that thermal ageing in air leads to an increase of thermo-oxidation and a decrease of crystallinitiy in LDPE. Meanwhile, changes in DC breakdown and conductivity are related to space charge dynamics, introduced by thermal ageing.

polyethylene, Space charge, thermal ageing
Li, Ziyun
e8f18288-a1f9-4e9d-9457-b4df24e172ab
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Li, Ziyun
e8f18288-a1f9-4e9d-9457-b4df24e172ab
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Li, Ziyun and Chen, George (2018) Space charge in thermally aged polyethylene and its electrical performance. Materials Research Express, 6 (3), [035308]. (doi:10.1088/2053-1591/aaf61b).

Record type: Article

Abstract

In past decades, significant effort has been made to establish the relationship between ageing and lifetime of electrical insulating materials. Generally, the chemical and physical structure of dielectrics can be affected by ageing, resulting in deterioration of their electrical performance (such as breakdown strength, dielectric loss and conductivity). Recently, the changes in trapping characteristics have been observed in aged polymeric materials. The present research intends to explore the relationship between ageing and space charge dynamics. For this purpose, low-density polyethylene (LDPE) films with different degrees of thermal ageing were prepared. A chemical analysis was performed based on the results from the Fourier-Transform Infrared (FTIR) and differential scanning calorimetry (DSC) techniques. Space charge dynamics were observed using the pulsed electroacoustic (PEA) method. In addition, DC electrical breakdown strength and conductivity were measured. The results indicate that thermal ageing in air leads to an increase of thermo-oxidation and a decrease of crystallinitiy in LDPE. Meanwhile, changes in DC breakdown and conductivity are related to space charge dynamics, introduced by thermal ageing.

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More information

Accepted/In Press date: 4 December 2018
e-pub ahead of print date: 4 December 2018
Published date: 14 December 2018
Keywords: polyethylene, Space charge, thermal ageing

Identifiers

Local EPrints ID: 429238
URI: http://eprints.soton.ac.uk/id/eprint/429238
PURE UUID: 33494dca-216f-4e06-99fe-06bba217c37f

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Date deposited: 22 Mar 2019 17:30
Last modified: 06 Oct 2020 18:33

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Contributors

Author: Ziyun Li
Author: George Chen

University divisions

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