Byproduct-free curing of a highly insulating polyethylene copolymer blend: An alternative to peroxide crosslinking
Artikel i vetenskaplig tidskrift, 2018

High-voltage direct-current (HVDC) cables are a critical component of tomorrow's power grids that seamlessly integrate renewable sources of energy. The most advanced power cable technology uses crosslinked polyethylene (XLPE) insulation, which is produced by peroxide crosslinking of low-density polyethylene (LDPE). Peroxide crosslinking gives rise to hazardous byproducts that compromise the initially excellent purity and cleanliness of LDPE, and hence increase the electrical conductivity of the insulation material. Therefore, a byproduct-free curing process, which maintains the processing advantages and high electrical resistivity of LDPE, is in high demand. Here, we demonstrate a viable alternative to peroxide crosslinking that fulfils these requirements. Click chemistry reactions between two polyethylene copolymers allow the design of a curing process that is additive-free and does not result in the release of any byproducts. The thermoplastic copolymer blend offers a broad processing window up to 140 °C, where compounding and shaping can be carried out without curing. At more elevated temperatures, epoxy and acrylic acid functional groups rapidly react without byproduct formation to form an infusible network. Strikingly, the crosslinked copolymer blend exhibits a very low direct-current (DC) electrical conductivity of 2 × 10-16 S cm-1 at a typical cable operating temperature of 70 °C, which is on par with values measured for both ultra-clean LDPE and commercial XLPE. Hence, the use of polyethylene copolymer blends opens up the possibility to replace peroxide crosslinking with click chemistry type reactions, which may considerably expand the versatility of the most common type of plastic used today.

Electrical power transmission networks


Synthesis (chemical)

HVDC power transmission insulation


Electrical conductivity



Polymer blends





Massimiliano Mauri

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Anna Peterson

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Khalid Elamin

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Antonis Gitsas

Borealis GmbH

Thomas Hjertberg

Borealis GmbH

Aleksandar Matic

Chalmers, Fysik, Kondenserade materiens fysik

Thomas Gkourmpis

Borealis GmbH

Oscar Prieto

Borealis GmbH

Christian Müller

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Journal of Materials Chemistry C

20507534 (ISSN) 20507526 (eISSN)

Vol. 6 42 11292-11302



Kemiska processer


Annan fysik



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