Molecular Dynamics Simulation of the Influence of Nano-SiO2 Filling on Thermo-mechanical Properties of Highly Cross-linked Epoxy Resin

被引：0

作者：

Xie Q. ^{[1
]}

Duan Q. ^{[1
]}

Zhang L. ^{[1
]}

Zhao Y. ^{[1
]}

Lu L. ^{[1
]}

Huang Z. ^{[2
]}

机构：

[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding

[2] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing

来源：

Gaodianya Jishu/High Voltage Engineering | 2020年 / 46卷 / 05期

基金：

国家重点研发计划;

关键词：

Epoxy resin; Insulation material; Molecular dynamics; Nano-SiO[!sub]2[!/sub] filling; Thermomechanical properties;

D O I：

10.13336/j.1003-6520.hve.20200515014

中图分类号：

学科分类号：

摘要：

In order to analyze the effects of nano-SiO2 filling on the properties of epoxy resin on a micro level, DGEBA and MTHPA were used as epoxy resin matrix and curing agent, respectively, and a composite model of high crosslinking degree of 90% of pure EP and SiO2/EP with particle sizes of 1. 5 nm and 2. 0 nm was established based on molecular dynamics. Then the effects of nano-SiO2 filling on the microstructure of epoxy composites and the improvement of thermomechanical properties were analyzed, and the effect of nano-SiO2 particle size on the performance improvement was compared. The results show that the thermomechanical properties of epoxy resin are improved by the addition of nano-SiO2, and the improvement of nano-SiO2 with a particle size of 1.5 nm is more significant. Specially, the nano-SiO2 with particle size of 1. 5 nm increases the glass transition temperature by 29.78 K, and the increases of Young's modulus, shear modulus, and bulk modulus are 16.83%, 6.02% and 4.20%, respectively. At the same time, the filling of nano-SiO2 changes the microstructural parameters of the epoxy composites, the cohesive energy density is enhanced significantly after filling nano-SiO2, and the fractional free volume and the mean square displacement decrease to variousg degrees. In addition, the nano-SiO2 with particle size of 1.5 nm has a more obvious effect on the microstructure of the composites. However, the filling of nano-SiO2 does not significantly change the total radial distribution function for the 90% crosslinked system. © 2020, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：1602 / 1611

页数：9

共 26 条

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