中国物理B ›› 2012, Vol. 21 ›› Issue (3): 33102-033102.doi: 10.1088/1674-1056/21/3/033102

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赵亮1 2,苏建仓2,潘亚峰2,张喜波2   

  • 收稿日期:2011-07-28 修回日期:2011-11-11 出版日期:2012-02-15 发布日期:2012-02-15
  • 通讯作者: 赵亮,zhaoliang0526@163.com E-mail:zhaoliang0526@163.com

The effect of polymer type on electric breakdown strength on a nanosecond time scale

Zhao Liang(赵亮)a)b), Su Jian-Cang(苏建仓)b), Pan Ya-Feng(潘亚峰)b), and Zhang Xi-Bo(张喜波)b)   

  1. a. Key laboratory of Physical Electronics and Devices of Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China;
    b. Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • Received:2011-07-28 Revised:2011-11-11 Online:2012-02-15 Published:2012-02-15
  • Contact: Zhao Liang,zhaoliang0526@163.com E-mail:zhaoliang0526@163.com

Abstract: Based on the concepts of fast polarization, effective electric field and electron impact ionization criterion, the effect of polymer type on electric breakdown strength (EBD) on a nanosecond time scale is investigated, and a formula that qualitatively characterizes the relation between the electric breakdown strength and the polymer type is derived. According to this formula, it is found that the electric breakdown strength decreases with an increase in the effective relative dielectric constants of the polymers. By calculating the effective relative dielectric constants for different types of polymers, the theoretical relation for the electric breakdown strengths of common polymers is predicted. To verify the prediction, the polymers of PE (polyethylene), PTFE (polytetrafluoroethelene), PMMA (organic glass) and Nylon are tested with a nanosecond-pulse generator. The experimental result shows EBD (PTFE) > EBD (PMMA) > EBD (Nylon) > EBD (PE). This result is consistent with the theoretical prediction.

Key words: electric breakdown strength, polymer type, nanosecond time scale, fast polarization phenomenon

中图分类号:  (Molecule transport characteristics; molecular dynamics; electronic structure of polymers)

  • 31.15.at
32.10.Hq (Ionization potentials, electron affinities) 77.22.Ej (Polarization and depolarization) 11.10.-z (Field theory)