热老化对聚丙烯电缆绝缘料聚集态结构的影响  

Effect of Thermal Aging on Aggregated State Structure of Polypropylene Cable Insulating Material

作　　者：张凯 刘爱民 段玉兵 高嫄 穆明亮 颜森 聂兴成 吴春海 ZHANG Kai;LIU Ai-min;DUAN Yu-bing;GAO Yuan;MU Ming-liang;YAN Sen;NIE Xing-cheng;WU Chun-hai(Binzhou Power Supply Company,State Grid Shandong Electric Power Company,Binzhou 256600,China;College of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]国网山东省电力公司滨州供电公司,山东滨州256600 [2]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《塑料科技》2024年第10期55-60,共6页Plastics Science and Technology

基　　金：国网山东省电力公司科技项目(520615230003)。

摘　　要：为了研究热老化对聚丙烯聚集态结构的影响,采用熔融共混和接枝改性方式分别制备了两种聚丙烯绝缘料,对各试样进行了加速热老化试验,并通过X射线衍射、差示扫描量热法、偏光显微镜对热老化前后试样的聚集态结构进行表征。结果表明:老化前的共混型聚丙烯仅存在α晶体,热老化可使其诱导产生β晶体,而接枝型聚丙烯老化前后均为α晶体和β晶体共存,但老化后β晶体含量出现明显下降。两种聚丙烯的结晶速率均较交联聚乙烯(XLPE)高。其中,接枝型聚丙烯具有明显的异相成核作用,其晶体更加完善且晶体尺寸分布均匀,结晶度高达40.17%。同时,在热老化过程中,接枝型聚丙烯试样表现出较优的抗热氧老化能力,受损程度明显低于共混型聚丙烯试样。In order to investigate the effect of thermal aging on the aggregation structure of polypropylene,two kinds of polypropylene insulating materials were prepared by melt blending and grafting modifications,and accelerated thermal aging tests were carried out on each specimen.The structures of the aggregated states before and after thermal aging were characterized by X-ray diffraction,differential scanning calorimetry,and polarizing optical microscopy.The results show that onlyα-crystals exist in the blended polypropylene before aging,and thermal aging can induce the production ofβ-crystals,while theαcrystals andβcrystals coexist in the grafted polypropylene before and after aging,butβcrystal content decreases significantly after aging.The crystallization rate of the two polypropylene is significantly higher than that of cross-linked polyethyline(XLPE),in which the grafted polypropylene has obvious heterophase nucleation,its crystal is more perfect and the crystal size distribution is uniform,and the crystallinity is as high as 40.17%.At the same time,grafted polypropylene specimens show better resistance to thermal oxygen aging,and the damage degree of grafted polypropylene specimens is significantly lower than that of blended polypropylene specimens.

关 键 词：聚丙烯 共混改性 接枝改性 聚集态结构 

分 类 号：TM247[一般工业技术—材料科学与工程] TQ325.14[电气工程—电工理论与新技术]