Regulating the structure of crosslinked polyethylene and its application in ultra‐high voltage cables

The crystallinity of polyethylene has been extensively studied, but in situ experiments designed to investigate the crystallization of PE and XLPE have hardly been discussed. In this work, the crystallization behavior of PE and XLPE was investigated by designing in situ crystallization observation e...

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Published in:Polymer engineering and science 2024-02, Vol.64 (2), p.496-505
Main Authors: Sun, Wu‐Ji, Liu, Xiong‐Jun, Yuan, Li‐Juan, Xiao, Han, Lu, Jian‐Mei
Format: Article
Language:English
Subjects:
Byproducts
Cables
COMSOL simulation
Cross-linked polyethylene
crosslinker
Crosslinking
Crystallinity
Crystallization
Finite element method
High voltages
Insulation
XLPE
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Summary:The crystallinity of polyethylene has been extensively studied, but in situ experiments designed to investigate the crystallization of PE and XLPE have hardly been discussed. In this work, the crystallization behavior of PE and XLPE was investigated by designing in situ crystallization observation experiments. We have compared the crystallinity, crosslinking, viscosity properties, and gas byproducts of different XLPE insulating materials. COMSOL simulations demonstrate that the DTAP and DTBP crosslinker initiated crosslinks have better insulating properties and cable stability than the DTBC and DTBTMC crosslinkers. The formation of an insulation layer initiated by the DTAP crosslinker is beneficial for improving the breakdown strength, processing performance, and stable operation of cables. Our work is of great significance for understanding the crystallinity of XLPE and determining the correct crosslinker. Highlights In situ crystallization observation of PE and XLPE. Simulation of ultra‐high voltage cables. Finite element analysis. Investigation of gas byproducts in XLPE. In‐situ experiments have demonstrated that straight‐chain crosslinkers (Path 1) and cycloalkane crosslinkers (Path 2) trigger the formation of different XLPE crystalline morphologies.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.26561