摘要
实验分别采用混酸、环氧大分子、硅烷偶联剂(KH560)对多壁碳纳米管(MWCNTs)表面进行改性制得酸化碳纳米管(C-MWCNTs)、环氧功能化碳纳米管(E-MWCNTs)、硅烷偶联化碳纳米管(Si-MWCNTs),将改性后的MWCNTs和有机化蒙脱土(O-MMT)通过溶液共混的方式与环氧树脂(EP)制备成环氧树脂纳米复合材料。通过分析试样的冲击实验数据、断面形貌以及MWCNTs的红外光谱来确定不同功能化方式处理的MWCNTs对纳米复合材料中界面区域的影响。借鉴界面势垒模型分析界面区域对纳米复合材料电性能的影响。分析结果表明,Si-MWCNTs、E-MWCNTs与环氧树脂的界面结合强度大于C-MWCNTs。当纳米掺杂组分质量分数相同时,Si-MWCNTs/EP中界面区域大于E-MWCNTs/EP中界面区域。当Si-MWCNTs在基体中分散均匀时,随Si-MWCNTs的质量分数的增加,Si-MWCNTs/EP中自由体积增加,键合区域对偶极极化限制性增强,二者共同促进Si-MWCNTs/EP纳米复合材料的介电常数和介质损耗的降低,过渡区域陷阱密度增大,Si-MWCNTs/EP纳米复合材料的击穿强度得到提高。O-MMT的加入减弱了MWCNTs在基体中的团聚,使MWCNTs/O-MMT/EP的电导率降低。
Carbon nanotubes(MWCNTs)were individually treated with mixed acids,epoxy macromolecules,and silane coupling agents,and the products were marked as C-MWCNTs,E-MWCNTs,Si-MWCNTs.The epoxy resin composites were made by blending MWCNTs,organic montmorillonite(O-MMT)and epoxy resin(EP).The influence of C-MWCNTs,E-MWCNTs,Si-MWCNTs on the interface of composites was investigated by analyzing the impact test data of samples,the section morphology of the composites and the infrared spectrum of MWCNTs.The influence of interface on the electrical property of composites was discussed by using the interface barrier model.The results show that the interface bonding strength between Si-MWCNTs(or E-MWCNTs)and epoxy resin is greater than that of C-MWCNTs.When the mass fraction of the MWCNTs is the same,the interface of Si-MWCNTs/EP is larger than the that of E-MWCNTs/EP.When Si-MWCNTs is dispersed evenly in the matrix,with the adding of Si-MWCNTs,free volume increases in Si-MWCNTs/EP,the bonding area expands,which enhances the restriction of bonding area on dipole polarization.The above two aspects jointly promote the reduction of dielectric constant and dielectric loss of Si-MWCNTs/EP.With the increase of MWCNTs,the transition region expands,the trap density increases,so the breakdown strength of Si-MWCNTs/EP composites is improved.The O-MMT weakens the agglomeration of MWCNTs in the matrix and reduces the conductivity of MWCNTs/O-MMT/EP.
作者
吴子剑
王晨
张明艳
裴鑫
姜鹏
Wu Zijian;Wang Chen;Zhang Mingyan;Pei Xin;Jiang Peng(Key Laboratory of Engineering Dielectric and Its Application Technology of Ministry of Education Harbin University of Science and Technology Harbin 150040 China;Department of Material Science and Technology Harbin University of Science and Technology Harbin 150040 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第16期3897-3905,共9页
Transactions of China Electrotechnical Society
基金
黑龙江省博士后面上项目一等资助(LBH-Z16089)
中国博士后面上项目一等资助(2017M610212)
工程电介质及其应用教育部重点实验室前沿项目预研基金(2018EDAQY05)
哈尔滨市科技创新人才项目(2017RAQXJ105)
黑龙江省普通本科高等学校青年创新人才培养计划资助
关键词
环氧树脂
碳纳米管
蒙脱土
界面区域
电性能
Epoxy resin
carbon nanotubes
montmorillonite
interface
electrical property
作者简介
吴子剑,男,1983年生,博士,讲师,研究方向为树脂基复合材料。E-mail:zijian.wu@hrbust.edu.com。;张明艳,女,1962年生,教授,主要从事工程电介质材料改性与高分子材料与工程专业的研究和教学工作。E-mail:taotaozh@hrbust.edu.cn(通信作者)。
