Invariant electrical conductivity upon thermal ageing of a crosslinked copolymer blend for high voltage insulation

Click chemistry type reactions between polyethylene-based copolymers are a promising and by-product free alternative to peroxide crosslinking of low-density polyethylene, which is widely used as an insulation material for high-voltage power cables. Here, the impact of thermal ageing on the long-term...

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Veröffentlicht in:Materials advances 2022-06, Vol.3 (11), p.4718-4723
Hauptverfasser: Kumara, Sarath, Pourrahimi, Amir Masoud, Soroudi, Azadeh, Xu, Xiangdong, Hammarström, Thomas, Serdyuk, Yuriy, Müller, Christian
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container_end_page 4723
container_issue 11
container_start_page 4718
container_title Materials advances
container_volume 3
creator Kumara, Sarath
Pourrahimi, Amir Masoud
Soroudi, Azadeh
Xu, Xiangdong
Hammarström, Thomas
Serdyuk, Yuriy
Müller, Christian
description Click chemistry type reactions between polyethylene-based copolymers are a promising and by-product free alternative to peroxide crosslinking of low-density polyethylene, which is widely used as an insulation material for high-voltage power cables. Here, the impact of thermal ageing on the long-term stability of the thermo-mechanical and dielectric properties of a copolymer blend is evaluated that can be cured through a by-product free reaction between the epoxy and carboxylic acid functional groups attached to the polyethylene backbone. It is observed that ageing at 90 °C in air for up to 2500 h does not affect the direct current (DC) electrical conductivity of about 3 × 10 −14 S m −1 , provided that a suitable antioxidant is added that prevents the thermo-oxidative degradation of the polyethylene backbone. Furthermore, the material maintains its thermo-mechanical properties upon ageing such as a high ductility at room temperature and a stiffness of about 1 MPa above the melting temperature of polyethylene. Evidently, the use of click chemistry type reactions is a promising strategy for the design of new high-voltage insulation materials that can be cured without the formation of by-products. Click chemistry type reactions between polyethylene-based copolymers are a promising and by-product free alternative to peroxide crosslinking of low-density polyethylene, which is widely used as an insulation material for high-voltage power cables.
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title Invariant electrical conductivity upon thermal ageing of a crosslinked copolymer blend for high voltage insulation
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