纳米SiO2掺杂对有水环境下间位芳纶绝缘纸性能影响的研究  

Study on theinfluence of nano-SiO2 doping on the performance of meta-aramid insulation paper in water environment

作　　者：李亚莎[1] 孟凡强 章小彬 梅益明 周筱 LI Ya-Sha;MENG Fan-Qiang;ZHANG Xiao-Bin;MEI Yi-Ming;ZHOU Xiao(College of Electrical Engineering and New Energy, Three Gorge University,Yichang 443002, China)

机构地区：[1]三峡大学电气与新能源学院,宜昌443002

出　　处：《原子与分子物理学报》2020年第3期371-377,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(51577105)。

摘　　要：为了进一步了解SiO2纳米粒子掺杂对有水环境下间位芳纶绝缘纸性能的影响以及有、无水环境下芳纶绝缘纸性能的变化,本文利用分子动力学的方法建立了有水存在的芳纶分子模型、经SiO2纳米掺杂后的芳纶分子模型以及无水参与的芳纶分子模型,研究了SiO2纳米掺杂和水分对芳纶绝缘纸在玻璃转化温度、均方位移及力学模量方面的影响.研究结果表明,水分的存在使得芳纶绝缘纸的玻璃转化温度由原先的549 K降为523 K,在此基础上进行纳米SiO2掺杂后玻璃转化温度可以由523 K提升到530 K.与无水环境芳纶绝缘纸的均方位移相对比可以发现,水分的存在在一定程度上提高了芳纶分子的链运动进而削弱了绝缘纸的热稳定性,而SiO2纳米改性可以减弱水分对芳纶绝缘纸的这种不利影响.改性后的绝缘纸在有水环境下的力学性能得以提升,通过对比有、无水环境下芳纶绝缘纸的力学模量可以发现,一定水分的加入反而使得绝缘纸的力学性能得到了一定的提升.最后对所得模拟结果进行了理论分析,为提升芳纶绝缘纸的性能提供了有益的参考.In order to further understand the influence of SiO2 nanoparticle doping on the properties of meta-aramid insulating paper in water environment and the change of aramid insulation paper in waterless environment.In this paper,three molecular models of aramid with water,aramid doped with SiO2 and aramid with no water participation were established by molecular dynamics method.The effects of SiO2 nanodoping and moisture on the glass transition temperature,mean square displacement and mechanical modulus of aramid insulation paper were studied.The results show that the glass transition temperature of aramid insulation paper is reduced from 549 K of no water participation to 523 K of water environment,and the glass transition temperature in water environment can be increased from 523 K to 530 K after nano-SiO2 doping.Compared with the mean square displacement of aramid insulating paper in anhydrous environment,it can be found that the presence of moisture increases the chain motion of the aramid molecule to a certain extent and weakens the thermal stability of the insulating paper,while the SiO2 nano-modification can weaken this adverse effect on aramid insulation paper in water environment.The mechanical properties of the modified insulating paper in the water environment can be improved.By comparing the mechanical moduli of the aramid insulating paper in the water and waterless environments,it can be found that the addition of certain moisture makes the mechanical properties of the insulating paper have a certain improvement.Finally,the theoretical analysis of the obtained simulation results provides a useful reference for improving the performance of aramid insulation paper.

关 键 词：芳纶绝缘纸 纳米SiO2掺杂 热力学性能 分子动力学模拟 

分 类 号：TM853[电气工程—高电压与绝缘技术]