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Polymers
Volume 18
Issue 11
10.3390/polym18111277
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Effect of Secondary Crosslinking Time on the Interfacial Insulation Performance of Crosslinked Polyethylene/Semiconductive Shielding Layer

by
Ming Hu
1,
Hongliang Zhang
2,
Xufei Ge
2,
Yan Yan
2,
Yuanhang Yang
2,
Xiaoyan Cao
3,*,
Zerui Li
3 and
Wenbo Huo
3
1
College of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510006, China
2
Zhongtian Technology Submarine Cable Co., Ltd., Nantong 226000, China
3
College of Electrical Engineering, Sichuan University, Chengdu 610065, China
*
Author to whom correspondence should be addressed.
Polymers 2026, 18(11), 1277; https://doi.org/10.3390/polym18111277
Submission received: 26 March 2026 / Revised: 15 May 2026 / Accepted: 18 May 2026 / Published: 22 May 2026
(This article belongs to the Section Polymer Analysis and Characterization)
Versions Notes

Abstract

To investigate the influence of secondary crosslinking time on the interfacial insulation performance between crosslinked polyethylene (XLPE) and a semiconductive shielding layer, XLPE sheets and semiconductive EVA pellets were selected. XLPE/semiconductive shielding layer interfacial specimens with secondary crosslinking times of 10 min, 15 min, 30 min, 45 min and 60 min were prepared. Polarization and depolarization current (PDC) measurements, breakdown voltage tests, peel adhesion strength evaluation and scanning electron microscopy (SEM) observations were systematically performed. The interfacial polarization current, characteristic breakdown voltage and interfacial peel adhesion strength of the specimens were obtained and analyzed. The experimental results indicate that, with increasing secondary crosslinking time, the interfacial polarization current showed an initial decrease followed by an increase, and the characteristic breakdown voltage and the interfacial peel adhesion strength showed an initial increase followed by a decrease. Further analysis suggests that an excessively long secondary crosslinking time reduces the area of the interfacial interpenetration region between XLPE and the semiconductive shielding layer, which is the primary factor responsible for the deterioration of interfacial insulation performance. The results provide experimental evidence and theoretical support for optimizing flexible joint manufacturing processes and improving their operational reliability and service lifetime.
Keywords: secondary crosslinking time; XLPE/semiconductive shielding layer interface; insulation performance; flexible joint secondary crosslinking time; XLPE/semiconductive shielding layer interface; insulation performance; flexible joint

Share and Cite

MDPI and ACS Style

Hu, M.; Zhang, H.; Ge, X.; Yan, Y.; Yang, Y.; Cao, X.; Li, Z.; Huo, W. Effect of Secondary Crosslinking Time on the Interfacial Insulation Performance of Crosslinked Polyethylene/Semiconductive Shielding Layer. Polymers 2026, 18, 1277. https://doi.org/10.3390/polym18111277

AMA Style

Hu M, Zhang H, Ge X, Yan Y, Yang Y, Cao X, Li Z, Huo W. Effect of Secondary Crosslinking Time on the Interfacial Insulation Performance of Crosslinked Polyethylene/Semiconductive Shielding Layer. Polymers. 2026; 18(11):1277. https://doi.org/10.3390/polym18111277

Chicago/Turabian Style

Hu, Ming, Hongliang Zhang, Xufei Ge, Yan Yan, Yuanhang Yang, Xiaoyan Cao, Zerui Li, and Wenbo Huo. 2026. "Effect of Secondary Crosslinking Time on the Interfacial Insulation Performance of Crosslinked Polyethylene/Semiconductive Shielding Layer" Polymers 18, no. 11: 1277. https://doi.org/10.3390/polym18111277

APA Style

Hu, M., Zhang, H., Ge, X., Yan, Y., Yang, Y., Cao, X., Li, Z., & Huo, W. (2026). Effect of Secondary Crosslinking Time on the Interfacial Insulation Performance of Crosslinked Polyethylene/Semiconductive Shielding Layer. Polymers, 18(11), 1277. https://doi.org/10.3390/polym18111277

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