短切纤维含量对间位芳纶纸性能影响及其构效关系机理分析  

Effect of Chopped Fiber Concentration on PMIA Paper Properties and Analysis of Structure-Activity Relationship Mechanism

作　　者：范晓舟 杨瑞[1] 樊思迪 刘云鹏 律方成[1,2] Fan Xiaozhou;Yang Rui;Fan Sidi;Liu Yunpeng;LüFangcheng(College of Electrical and Electronic Engineering North China Electric Power University,Beijing 102206 China;Hebei Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University,Baoding 071003 China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]华北电力大学河北省输变电安全防御重点实验室,保定071003

出　　处：《电工技术学报》2024年第21期6921-6931,共11页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资助项目(2023MS002,2023MS006)。

摘　　要：为研究短切纤维含量对间位芳纶纸绝缘性能和力学性能的影响及其构效关系机理,该文制备了不同短切纤维含量的对间位芳纶纸样品,测试了拉伸强度、杨氏模量、击穿强度、体电导率和电荷陷阱特性,将不同纤维含量样品的测试结果进行对比,并结合相场击穿模拟和分子动力学仿真分析了其构效关系机理。结果表明,随着短切纤维含量的增加,间位芳纶纸的力学性能先上升后下降,在短切纤维质量分数为20%时达到最佳,拉伸强度和杨氏模量分别达到31.9MPa和2.39GPa;其击穿强度在引入少量短切纤维时出现了下降的情况,在短切纤维质量分数达到30%时,短切纤维形成了一种“层状交联”结构,增强了其对载流子迁移的阻碍作用,其击穿强度高于纯浆粕纸,达到180.9 kV/mm。In order to study the effect of chopped fiber concentration on the insulation and mechanical properties of PMIA paper and its structure-activity relationship mechanism,samples of PMIA paper with different chopped fiber concentration were prepared,tensile strength,Young's modulus,breakdown strength,conductivity and charge trap were tested,the test results of samples with different fiber concentration were compared,and the structure-activity relationship mechanism was analyzed by combining phase field breakdown simulation and molecular dynamics simulation.The results showed that with the increase of chopped fiber concentration,the mechanical properties of meta-aramid paper initially increased and then decreased,with the optimum performance reached at a weight fraction of 20%of chopped fiber,and the tensile strength and Young's modulus reached 31.9 MPa and 2.39 GPa,respectively.When the weight fraction of chopped fiber reaches 30%,the chopped fiber forms a"layered cross-linking"structure,which enhances its hindering effect on carrier migration,and its breakdown strength is higher than that of pure pulp paper,reaching 180.9 kV/mm.Firstly,the PMIA paper was prepared using the wet-laid method with tunable chopped fiber concentration.2000 mL of DI water,130 mL of PEO solution(weight fraction=0.052%),and precipitated fibers are mixed together into a fiber dissociator and dissociated at a rate of 3000 r/min for 5 minutes.The chopped fibers are then added together and the dissociation is continued for 25 minutes.Next,the suction filtration and paper making are performed.The prepared paper is dried in a vacuum at 110℃for 20 minutes to remove most of the moisture.The as prepared paper is then placed on a heating plate for flatness and kept for completely dry before taking it out for later use.Finally,the paper was hot pressed three times using a flat vulcanizer and a chrome plated mold with parameters of 270℃,10 MPa,and 10 s.The composite paper prepared by this process has a diameter of(200±2)mm and a thickness of(0.16�

关 键 词：间位芳纶 击穿强度 拉伸强度 相场模拟 分子动力学 

分 类 号：TM215.6[一般工业技术—材料科学与工程]