The energy criterion for breaking chemical bonds in electrical breakdown process of polymers

Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 1994-07-03 DOI:10.1109/ICPADM.1994.413947

Hengkun Xie, Xinyan Wu, Zongren Peng, Hui Zhang

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引用次数: 8

Abstract

The energy required for electrons to break chemical bonds is traditionally referred to as the bonding energy. On the basis of chemical structure theory and the characteristics of electrical breakdown in polymers, the present paper suggests that the bonding energy is inadequate to express the energy required for breaking chemical bonds of polymers in electrical breakdown processes. Based on a comprehensive analysis of the breakdown strength and morphology parameters measured with X-ray photoelectron spectrometry (XPS), small-angle X-ray scattering (SAXS) and X-ray wide angle diffraction (XWAD) techniques, the calculated energy required for breaking chemical bonds causing breakdown of polypropylene is about 8.2 eV, which is approximately equal to the band gap energy (E/sub g/). Both the theoretical analysis and the experimental results in the present study show clearly that the band gap (E/sub g/), instead of the bonding energy, should be considered as the energy criterion for breaking chemical bonds in electrical breakdown processes of polymers.<>

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聚合物电击穿过程中化学键断裂的能量判据

电子打破化学键所需的能量传统上称为成键能。根据化学结构理论和聚合物电击穿的特点，本文认为化学键能不足以表示聚合物电击穿过程中化学键断裂所需的能量。综合分析了x射线光电子能谱(XPS)、x射线小角散射(SAXS)和x射线广角衍射(XWAD)等技术测量的击穿强度和形貌参数，计算出导致聚丙烯击穿的化学键断裂所需能量约为8.2 eV，近似等于带隙能(E/sub g/)。本研究的理论分析和实验结果都清楚地表明，在聚合物的电击穿过程中，应考虑带隙(E/sub g/)而不是化学键能作为破坏化学键的能量标准。

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Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)

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