Polypropylene-based blend with enhanced breakdown strength under gamma-ray irradiation for cable insulation  

作　　者：Bai-Xin Liu Yu Gao Jing Li Chen-Yi Guo Bo-Sen Si Jun-Guo Gao Yu Chen Bo-Xue Du 

机构地区：[1]School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China [2]Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China [3]State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China

出　　处：《Nuclear Science and Techniques》2025年第1期35-48,共14页核技术(英文)

基　　金：supported by the National Natural Science Foundation of China(No.52077151);the State Key Laboratory of Electrical Insulation and Power Equipment(No.EIPE23208);the Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education(No.KFM202203).

摘　　要：This study focuses on the electrical properties and microstructure of polypropylene(PP)-based blends used for cable insulation in nuclear power plants(NPPs).The PP-based blend,comprising isotactic PP and propylene-based elastomer(PBE)at concentrations ranging from 0 to 50 wt%,underwent a melt blending process and subsequent cobalt-60 gamma-ray irradiation with doses ranging from 0 to 250 kGy.Electrical conductivity,trap distribution,and alternating(AC)breakdown strength were chosen to assess the insulation performance.These results indicate that the addition of PBE significantly improves the electrical properties of PP under irradiation.For PP,the electrical conductivity increased with irradiation,whereas the trap depth and breakdown strength decreased sharply.Conversely,for the blend,these changes initially exhibit opposite trends.When the irradiation was increased to 250 kGy,the AC breakdown strength of the blend improved by more than 21%compared to that of PP.The physical and chemical structures of the samples were investigated to explore the improvement mechanisms.The results offer insights into the design of new cable-insulation materials suitable for NPPs.

关 键 词：Nuclear power plant Cable insulation POLYPROPYLENE Electrical properties Gamma-ray irradiation 

分 类 号：TM623[电气工程—电力系统及自动化] TM21[一般工业技术—材料科学与工程]