摘要
使用多巴胺(DA)和3-缩水甘油氧基丙基三甲氧基硅烷(KH560)对氮化硼纳米片(BNNS)进行双层表面改性,结合FTIR、TGA、SEM实验测试和反应分子动力学模拟,探讨双层表面改性的BNNS对环氧基(EP)绝缘材料热稳定性的影响。结果表明:聚多巴胺(PDA)末端接枝KH560和KH560末端接枝DA两种双层改性方法均成功修饰BNNS表面,并且双层表面改性的BNNS在复合材料中具有更好的分散性;双层表面改性的BNNS/EP的电气强度均高于31.2 kV/mm;双层表面改性能够显著提高复合材料的热稳定性,其中KH560末端接枝DA的双层改性方法对于提升复合材料热稳定性的效果最佳。KH560末端接枝DA的双层共价键接枝长链的改性方法,有利于增强界面相容性,使得BNNS与EP基体相互作用力更大,且长支链可以填充材料内部的空隙,从而增强复合材料的热稳定性。
Dopamine(DA) and 3-glycidoxypropyltrimethoxysilane(KH560) were used to double-layer surface modification of boron nitride nanosheet(BNNS), the effect of the modified BNNS on thermal stability of epoxybased(EP) insulating materials was discussed combining FTIR, TGA, and SEM experimental test with reactive molecular dynamics simulation. The results show that both methods of grafting KH560 at the end of polydopamine(PDA) and grafting DA at the end of KH560 can modify the BNNS surface successfully, and the double-layer surface modified BNNSs have better dispersion in composites. Besides, the breakdown strength of double-layer surface modified BNNS/EP composites is higher than 31.2 kV/mm. The thermal stability of composites can be obviously improved by double-layer surface modification, the improving effect of grafting DA at the end of KH560 is optimal. The modification of double-layer covalent bond grafting long chains that grafting DA at the end of KH560 can improve the interfacial compatibility, which can enhance the interaction force between BNNN and EP matrix. Moreover, the long chain branch is beneficial to fill the void inside the materials, and so that the thermal stability of composites increases.
作者
吴毅
李志刚
刘智辰
成先文
杨子瑞
曾健
WU Yi;LI Zhigang;LIU Zhichen;CHENG Xianwen;YANG Zirui;ZENG Jian(Yancheng Power Supply Branch of State Grid Jiangsu Electric Power Co.,Ltd.,Yancheng 224000,China)
出处
《绝缘材料》
CAS
北大核心
2022年第2期44-50,共7页
Insulating Materials
关键词
环氧树脂
氮化硼纳米片
双层表面改性
复合材料
绝缘性能
热稳定性
epoxy resin
boron nitride nanosheet
double-layer surface modification
composite materials
insulating properties
thermal stability
作者简介
吴毅(1984-),男(汉族),江苏盐城人,高级工程师,主要从事配网检修与运行管理的研究。44。
