熔融状态下聚乙烯电缆料老化行为的研究  

Study on the Aging Behaviors of Polyethylene Cable Materials in Melting State

作　　者：张极皓 王琦[1] 周洪鹏 韩志东[1,3] ZHANG Jihao;WANG Qi;ZHOU Hongpeng;HAN Zhidong(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150040,China;Zhongtian Radio Frequency Cable Co.,Ltd.,Nantong 226009,China;Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,黑龙江哈尔滨150040 [2]中天射频电缆有限公司,江苏南通226009 [3]哈尔滨理工大学工程电介质及其应用教育部重点实验室,黑龙江哈尔滨150080

出　　处：《塑料工业》2024年第4期110-116,共7页China Plastics Industry

摘　　要：在200℃的老化温度下,分别采用静态和动态热老化试验方法研究了熔融状态下聚乙烯(PE)电缆料的老化行为。分析了熔融状态及老化时间对PE材料结构、拉伸性能和介电性能的影响。结果表明,静态老化以材料表面氧化为主并表现出较高的表面羰基指数;动态老化材料氧化均匀并伴有大分子主链的断裂,其羰基指数显著低于静态老化样品的表面羰基指数;老化后样品的断裂伸长率随老化时间的增加而显著降低,介电常数和电导率表现出随老化时间增加而增加的趋势。动态老化过程使得材料力学性能失效提前,介电常数增加显著,可用于快速评价PE电缆料的老化行为。The aging behaviors in the molten state of polyethylene(PE)materials for cables were studied by using static and dynamic thermal aging test methods at 200℃.The effects of the molten state and aging time on the structures,tensile properties,and dielectric properties of PE materials were analyzed.The results show that static aging is mainly caused by the surface oxidation of material and exhibits a high surface carbonyl index.Dynamic aging materials exhibits uniform oxidation accompanied by the degradation of the main chains of macromolecules.Its carbonyl index is significantly lower than the surface carbonyl index of static aging samples.The elongation at break of the aged samples decreases significantly with the increasing of aging time,the dielectric constant and conductivity show an increasing tendency with the increasing of aging time.The dynamic aging process makes the mechanical properties of the material fail in advance and the dielectric constant increase significantly,which can be used to quickly evaluate the aging behaviors of PE cable materials.

关 键 词：聚乙烯 热老化 电缆料 拉伸性能 介电性能 

分 类 号：TQ325.1+2[化学工程—合成树脂塑料工业]