Effect of bilateral asymmetric temperature cooling on electrical properties of polypropylene insulation materials
Gao J. Gao H. Gao H. Liu X. Han X. Shi B. Idrisheva Z. Toshtay K. Zhang J. Algadi H. Wu Z. Seok I.
2 April 2026Elsevier Ltd
Polymer
2026#350
The cable production process plays a critical role in determining cable performance, with the cooling process having a particularly significant impact on the overall performance of polypropylene cables. To investigate the effects of bilateral asymmetric temperature cooling on the microcrystalline morphology and comprehensive performance of polypropylene-insulated cables, this study prepared four types of samples with different temperature differences between their two sides by controlling the cooling temperatures on each side. The research systematically examined the influence of asymmetric bilateral cooling on spherulite size distribution, crystallinity, thermal conductivity, electrical properties (volume resistivity, relative permittivity, dielectric loss, AC breakdown strength), and conductive activation energy. Special emphasis was placed on analyzing the directional differences in performance resulting from asymmetric cooling on the two sides. The experimental results indicate that an appropriate cooling temperature difference can optimize the crystalline morphology and significantly enhance the overall performance. When the high-voltage electrode is placed on the higher-temperature side for testing (forward testing), the material exhibits superior insulation properties (higher volume resistivity, higher breakdown field strength, and lower dielectric loss), higher thermal conductivity, and higher conductive activation energy. Among the samples, PP-70-20 demonstrated the optimal overall performance during forward testing. This study provides important theoretical guidance for the cooling process in the practical production of polypropylene.
Cable production process , Cooling temperature , Electrical properties , Mechanical properties , Polypropylene , Thermal conductivity
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Key Laboratory of Engineering Dielectrics and Its Applications, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, China
State Key Laboratory of High-Efficiency Special Cable Technology, Harbin, 150080, China
State Key Laboratory of Electrical Insulation and Power Equipment, Xian Jiaotong University, Xian, 710049, China
Jiangsu Shangshang Cable Group Co., Ltd., Liyang, 213300, China
Department of Material Science and Technology, Harbin University of Science and Technology, Heilongjiang, Harbin, 150040, China
D. Serikbaev East Kazakhstan Technical University, 19 D. Serikbayev str., Oskemen, 070004, Kazakhstan
Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
College of Chemical Engineering and Technology, Taiyuan University of Science and Technology, Taiyuan, 030024, China
College of Engineering and Computer Science, Arkansas State University, Jonesboro, 72401, AR, United States
Key Laboratory of Engineering Dielectrics and Its Applications
State Key Laboratory of High-Efficiency Special Cable Technology
State Key Laboratory of Electrical Insulation and Power Equipment
Jiangsu Shangshang Cable Group Co.
Department of Material Science and Technology
D. Serikbaev East Kazakhstan Technical University
Faculty of Chemistry and Chemical Technology
College of Chemical Engineering and Technology
College of Engineering and Computer Science
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