A Raman spectroscopic study of bulk and surface ageing phenomena in polyethylene

2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2003-10-19 DOI:10.1109/CEIDP.2003.1254815

X.S. Liu, A. Vaughan, G. Chen

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引用次数: 7

Abstract

Low density polyethylene (LDPE) films were subjected to a range of electrical stresses. Analysis of samples aged in the bulk by Raman microprobe spectroscopy indicated that changes in the spectra are only observed when samples are subjected to high electrical stresses for long periods of time. Even then, no specific chemical effects were detected; degradation only manifested itself in the form of mild fluorescence. Corona-induced surface reactions were also examined. Although the surface texture was found to change radically, subsequent Raman analysis revealed few chemical changes in the polymer, implying that erosion involves fragmentation of the LDPE and the formation of volatile by-products. No residues were detected on the samples. In addition to the LDPE itself, the corona electrode was also analyzed. This revealed the presence of extensive deposits with the fingerprint of sp/sup 2/ hybridized carbon. The significance of these results are discussed with respect to high field ageing processes, particularly, the development of electrical trees.

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聚乙烯体老化和表面老化现象的拉曼光谱研究

低密度聚乙烯(LDPE)薄膜受到一系列电应力。用拉曼微探针光谱法对样品进行整体老化分析表明，只有当样品长期处于高电应力下时，光谱才会发生变化。即便如此，也没有检测到特定的化学效应;降解只表现为轻微的荧光。还检测了电晕诱导的表面反应。尽管发现表面结构发生了根本性的变化，但随后的拉曼分析显示聚合物的化学变化很少，这意味着侵蚀涉及LDPE的破碎和挥发性副产物的形成。样品中未检测到残留物。除LDPE本身外，还对电晕电极进行了分析。这表明存在大量具有sp/sup 2/杂化碳指纹的沉积物。讨论了这些结果对高场老化过程的意义，特别是对电树的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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