Interface of Epoxy Resin Composites, and Its Influence on Electrical Performance
Wu Zijian1,2, Wang Chen2, Zhang Mingyan1,2, Pei Xin2, Jiang Peng2
1. Key Laboratory of Engineering Dielectric and Its Application Technology of Ministry of Education Harbin University of Science and Technology Harbin 150040 China; 2. Department of Material Science and Technology Harbin University of Science and Technology Harbin 150040 China
Abstract：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.
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2018, Vol. 33 
