The effect of polymer type on electric breakdown strength on a nanosecond time scale |
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| Authors: | Zhao Liang ab Su Jian-Cang b Pan Ya-Feng b and Zhang Xi-Bo |
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| Institution: | b) 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 |
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| 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(E BD) 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 E BD(PTFE) > E BD(PMMA) > E BD(Nylon) > E BD(PE).This result is consistent with the theoretical prediction. |
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| Keywords: | electric breakdown strength polymer type nanosecond time scale fast polarization phenomenon |
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