摘要
衣康酸基环氧树脂(EIA)是利用可再生资源衣康酸制备的环保型环氧树脂,具备应用于电工绝缘材料的前景。为此,探索了EIA的电树枝引发及生长特性,并与常规E–51型环氧树脂(EP)进行了对比研究。通过试验观测了工频电压下两种树脂中电树枝的引发特性以及12 kV和14 kV下的电树枝生长情况,并采用分子动力学模拟(MD)方法建立了EIA和EP的交联结构模型并计算了其微观结构参数以分析其分子结构对其耐电树枝特性的影响机理。试验及MD仿真结果表明,EP树脂存在庞大的苯基链结构,限制了聚合物主链的旋转或移动,自由体积较小,导致其电树枝引发电压较高,但电树枝主要以枝状电树枝为主,后续生长较为迅速;相对而言,EIA树脂分子交联模型为柔性长链结构,自由体积占比较大,其电树枝引发电压较低且引发后短时间内增长较快,但其电树枝主要以丛状电树枝为主,后续生长缓慢。
Itaconic-acid-based epoxy resin(EIA)is an environmentally friendly epoxy resin prepared from itaconic acid,a renewable resource.The characteristics of electric tree initiation and growth in itaconic-acid-based epoxy resin were explored and compared with conventional E−51 epoxy resin(EP)to evaluate its feasibility as an internal insulating material.The initiation voltage of electric tree branches in the two resins under power frequency voltage was tested,and the growths of electric tree branches under 12 kV and 14 kV were observed.Molecular dynamics simulation(MD)was used to establish the cross-linked structure model of EIA and EP,and its microstructural parameters were calculated to analyze the influence mechanism of the cross-linked structure on the characteristics of electrical resistance dendrites.The test and MD simulation results show that the EP resin has a massive phenyl chain structure,which limits the rotation or movement of the polymer main chain,and the free volume is small,resulting in a higher electric tree initiation voltage;however,its electric tree branches are mainly branch-like electrical branches,and the subsequent growth is relatively rapid.Relatively speaking,the EIA resin molecular cross-linking model is a flexible long-chain structure,with a relatively large free volume,and its electric tree initiation voltage is low and it grows faster in a short period of time after initiation.However,its electrical branches are mainly clump-like electrical branches,and the subsequent growth is slow.
作者
刘贺晨
郭展鹏
刘云鹏
周松松
吴璇
LIU Hechen;GUO Zhanpeng;LIU Yunpeng;ZHOU Songsong;WU Xuan(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense,North China Electric Power University,Baoding 071003,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第7期2607-2615,共9页
High Voltage Engineering
基金
国家自然科学基金(52007062)
中央高校基本科研业务费专项资金(2020MS088)。
关键词
衣康酸基环氧树脂
双酚A环氧树脂
电树枝特性
分子模拟
微观结构
itaconic acid based epoxy resin
bisphenol A epoxy resin
electric tree
molecular dynamics
microstructural
