摘要
聚丙烯薄膜是电力电容器中应用最广泛的储能介质,其介电性能取决于粒料微观结构及拉伸工艺参数。该文以不同等规度的聚丙烯粒料为研究对象,采用不同拉伸倍率获得聚丙烯薄膜,研究了不同聚丙烯薄膜的表面形貌及结晶特性,分析了不同温度下聚丙烯薄膜电导率、介质损耗、击穿强度及储能特性等介电性能,探究了微观结构参数及拉伸倍率对聚丙烯薄膜介电性能的影响机理。研究结果表明:等规度为99.6%、拉伸倍率为4×5的聚丙烯薄膜试样电导率最低、击穿强度最高;等规度的提升能够增强分子链的热稳定性,改善聚丙烯非晶区分子链的松散结构,阻止电弱点的发展;此外,合理的拉伸倍率能够使聚丙烯的分子链发生取向排列,形成有序的结晶形态,从而提高结晶度。研究结果可为聚丙烯薄膜介电性能的提升提供实验与理论支撑。
Polypropylene film is the most widely used energy storage medium in power capacitors,and its dielectric properties depend on the micro-structure of the particles and stretching process parameters.In this paper,polypropylene pellets with different isotacticity were taken as the research object,and polypropylene films were obtained by different stretching ratios.The surface morphology and crystallization characteristics of different polypropylene films were studied,the dielectric loss,breakdown strength,and energy storage chareacteristics of polypropylene films under different temperatures were analyzed.The influence mechanism of micro-structure parameters and stretching ratio on dielectric properties of polypropylene films was investigated.The results show that the polypropylene film sample with isotacticity of 99.6%and stretching ratio of 4×5 has the lowest conductivity and the highest breakdown strength.The improvement of the isotacticity can enhance the thermal stability of the molecular chain,improve the loose structure of the molecular chain in the amorphous region of polypropylene,and prevent the development of electrical weaknesses.In addition,a reasonable stretching ratio can enable the molecular chains of polypropylene to align and form an orderly crystalline morphology,and to increase the crystallinity.The research results can provide experimental and theoretical support for the improvement of dielectric properties of polypropylene films.
作者
邢照亮
杜潇丹
杜伯学
肖萌
郭少玮
郝建红
XING Zhaoliang;DU Xiaodan;DU Boxue;XIAO Meng;GUO Shaowei;HAO Jianhong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China;School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第6期2344-2353,共10页
High Voltage Engineering
基金
国家自然科学基金(92266111,52177023,U1966203)
国家电网公司总部科技项目(5500-202358774A-3-6-ZX)。
关键词
等规度
拉伸倍率
薄膜电容器
聚丙烯薄膜
介电性能
导电率
击穿强度
isotacticity
stretching ratio
film capacitors
polypropylene film
dielectric property
conductivity
breakdown strength
作者简介
邢照亮,1988-,男,硕士,高工主要从事电工绝缘材料、电容器关键技术方面的研究工作,E-mail:xingzhaoliang007@163.com;杜潇丹,2000-,女,硕士主要从事电容器用聚丙烯薄膜性能提升方面的研究工作,E-mail:tjuduxiaodan@163.com;杜伯学,1961-,男,博士,教授,博导主要从事聚合物绝缘材料的可靠性和安全性理论与试验、高温超导电介质、纳米复合绝缘材料、电气绝缘在线监测、高电压新技术等方面的研究工作,E-mail:duboxue@tju.edu.cn;通信作者:肖萌,1988-,男,博士,副教授,博导主要从事聚合物绝缘失效机理、聚合物储能关键技术方面的研究工作,E-mail:tjuxiaomeng@tju.edu.com;郭少玮,1995-,男,硕士,工程师主要从事电工绝缘材料及电容器技术开发工作,E-mail:guoshw@foxmail.com;郝建红,1960-,女,博士,教授主要从事新型电子器件及强流辐照效应等方面的研究。
