報告時間：1月10日13:00-17:30

報告地點：閔行校區生物藥學樓樹華多功能廳

聯系人：魏冬青✔️💆，徐沁（34204348🫳， This e-mail address is being protected from spambots. You need JavaScript enabled to view it. )

報告摘要1💇🏽：

Polyethylene insulators: lessons from nanoscale modelling

N. Quirke*

Department of Chemistry, Imperial College, London, UK

This e-mail address is being protected from spambots. You need JavaScript enabled to view it.

Polyethylene is commonly used as an insulator for AC power cables.  However over time it is known to undergo chemical and physical change which can lead to dielectric breakdown. Despite almost eighty years of experimental characterization of its electrical properties, very little is known about the details of the electrical behaviour of this material at the nanoscale yet an understanding of the mechanisms of nanoscale charge trapping and transport  could help in the development of materials with better insulating properties required for the next generation of high voltage AC and DC cables. Molecular simulation techniques provide a unique tool with which to study dielectric processes at the atomic and electronic level. Here we summarise our recent simulation results [1,2,3], elucidating the role of morphology in the trapping of excess electrons.

1)      Y. Wang, D. Mackernan,D. Cubero,D. Coker, N. Quirke, submitted for publication, 2013

2)      Y. Wang , K Wu1, D. Cubero,  and N. Quirke, ‘’Molecular modelling of Polyethylene’’, IEEE Trans (2013, in press)

3)      D. Cubero, N. Quirke , D. F. Coker, ”Electronic transport in disordered n -alkanes: From fluid methane to amorphous polyethylene ”, J. Chem. Phys., Vol. 119, pp. 2669-2679, 2003

*Professor of Chemical Physics at Imperial College London; Fellow of the Royal Society of Chemistry; Chang Jiang Fellow, State Key Lab. of Electrical Insulation and Power Equipment , Xi'an Jiaotong University, Xi'an, Shaanxi