Microcosmic Properties of LDPE/SiO2 Nano-composite by Molecular Simulation

被引：0
|
作者：
Fan P. [1 ]
Zhou D. [1 ]
Yan H. [1 ]
Li J. [1 ]
机构：
[1] Guangzhou Branch, EHV Power Transmission Company of China Southern Power Grid, Guangzhou
来源：
Fan, Peng (fanpeng_hi@163.com) | 1600年 / Science Press卷 / 43期
关键词：
Insulation material; Low-density polyethylene; Moisture; Molecular simulation; Nano-silica; Temperature;
D O I：
10.13336/j.1003-6520.hve.20170831014
中图分类号：
学科分类号：
摘要：
In order to research the glass transition temperature (Tg), the mean square displacement of the polyethylene chain and the diffusion coefficient of moisture in the low-density polyethylene (LDPE) and SiO2 nano-composite, different composite models of the amorphous region of low-density polyethylene, nano-silica and moisture were constructed by molecular dynamics (MD) simulation. Results indicate that the moisture decreases the glass transition temperature of the composites. The addition of nano-silica enhances the thermal stability of the composites and increases the glass transition temperature of the composites and inhibits the chain motion of polyethylene molecules in the composites. The diffusion coefficient of moisture increases along with the increasing temperature and the addition of nano-silica reduces the diffusion coefficient of moisture in molecules. The moisture will be local reunion by the hydrogen bond when temperature is around 300 K and along with the rising temperature the hydrogen bonds disappear. The research results can provide a useful reference for the thermal aging test of polyethylene. © 2017, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：2875 / 2880
页数：5
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