摘要
Epoxy-based composites containing montmorillonite（MMT） modified by silylation reaction with γ-aminopropyltriethoxysilane（γ-APTES） and 3-（glycidyloxypropyl） trimethoxysilane（GPTMS） are successfully prepared.The effects of filler loading and surface modification on the electrical and thermal properties of the epoxy/MMT composites are investigated. Compared with the pure epoxy resin, the epoxy/MMT composite, whether MMT is surface-treated or not, shows low dielectric permittivity, low dielectric loss, and enhanced dielectric strength. The MMT in the epoxy/MMT composite also influences the thermal properties of the composite by improving the thermal conductivity and stability.Surface functionalization of MMT not only conduces to the better dispersion of the nanoparticles, but also significantly affects the electric and thermal properties of the hybrid by influencing the interfaces between MMT and epoxy resin.Improved interfaces are good for enhancing the electric and thermal properties of nanocomposites. What is more, the MMT modified with GPTMS rather than γ-APTES is found to have greater influence on improving the interface between the MMT filler and polymer matrices, thus resulting in lower dielectric loss, lower electric conductivity, higher breakdown strength, lower thermal conductivity, and higher thermal stability.
Epoxy-based composites containing montmorillonite（MMT） modified by silylation reaction with γ-aminopropyltriethoxysilane（γ-APTES） and 3-（glycidyloxypropyl） trimethoxysilane（GPTMS） are successfully prepared.The effects of filler loading and surface modification on the electrical and thermal properties of the epoxy/MMT composites are investigated. Compared with the pure epoxy resin, the epoxy/MMT composite, whether MMT is surface-treated or not, shows low dielectric permittivity, low dielectric loss, and enhanced dielectric strength. The MMT in the epoxy/MMT composite also influences the thermal properties of the composite by improving the thermal conductivity and stability.Surface functionalization of MMT not only conduces to the better dispersion of the nanoparticles, but also significantly affects the electric and thermal properties of the hybrid by influencing the interfaces between MMT and epoxy resin.Improved interfaces are good for enhancing the electric and thermal properties of nanocomposites. What is more, the MMT modified with GPTMS rather than γ-APTES is found to have greater influence on improving the interface between the MMT filler and polymer matrices, thus resulting in lower dielectric loss, lower electric conductivity, higher breakdown strength, lower thermal conductivity, and higher thermal stability.
作者
贾梓睿
高振国
兰笛
成永红
吴广磊
吴宏景
Zi-Rui Jia1,2, Zhen-Guo Gao1,3,Di Lan1, Yong-Hong Cheng2, Guang-Lei Wu2,3, and Hong-Jing Wu(1 School of Science, Northwestern Polytechnical University, Xi＇an 710072, China 2 Center of Nanomaterials for Renewable Energy （CNRE）, State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi＇an 3iaotong University, Xi＇an 710049, China 3 Institute of Materials for Energy and Environment, State Key Laboratory Breeding Based of New Fiber Materials and Modem Textile College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.21806129,51872238,51407134,and 51521065)
the China Postdoctoral Science Foundation(Grant No.2016M590619)
the Natural Science Foundation of Shandong Province,China(Grant No.ZR2016EEQ28)
the State Key Laboratory of Electrical Insulation and Power Equipment,China(Grant No.EIPE14107)
the Fundamental Research Funds for the Central Universities,China(Grant No.3102018zy045)
the Natural Science Basic Research Plan in Shaanxi Province,China(Grant No.2017JQ5116)
