The role of oxidation in the water treeing progress in low density polyethylene (LDPE)

Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP '93) Pub Date : 1993-10-17 DOI:10.1109/CEIDP.1993.378890

H. Li, B. Crichton, R. Fouracre, M. Given, Y. Liang

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Abstract

In an attempt to understand ion specific properties and the significance of oxidation in the water treeing process, an experimental examination of oxidation and tree growth in LDPE has been undertaken. In a series of water tree growth tests, conditions promoting oxidation were present either during or prior to tree development. FTIR (Fourier-transform infrared) techniques were employed to assess any oxidation occurring during tree growth in samples aged in the laboratory using ionic solutions of FeCl/sub 3/, KMnO/sub 4/, or LiCl. The lengths of trees grown in virgin and pre-oxidized LDPE using a LiCl solution have been compared. Neither enhanced tree growth nor significant oxidation was observed for LDPE samples aged in strong oxidizing solutions of FeCl/sub 3/ and KMnO/sub 4/. This shows that oxidation is not responsible for the observed tree growth characteristics. Reduced water tree growth was observed in highly oxidized material, indicating that the presence of such material is not significant in the water treeing process and that thermal oxidation alone is unlikely to be important during treeing.<>

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氧化在低密度聚乙烯(LDPE)水树化过程中的作用

为了了解离子特性和氧化在水树形过程中的意义，对LDPE中的氧化和树形生长进行了实验研究。在一系列的水树生长试验中，促进氧化的条件存在于树木发育期间或之前。FTIR(傅里叶变换红外)技术用于评估树木生长过程中使用FeCl/sub - 3/， KMnO/sub - 4/或LiCl的离子溶液在实验室老化的样品中发生的任何氧化。用LiCl溶液比较了在未氧化LDPE和预氧化LDPE中生长的树的长度。在FeCl/sub - 3/和KMnO/sub - 4/强氧化溶液中老化的LDPE样品既没有增强树木生长，也没有明显的氧化。这表明氧化不是观察到的树木生长特性的原因。在高度氧化的材料中观察到水树生长减少，这表明这种材料的存在在水树生长过程中并不显著，并且热氧化在树木生长过程中不太可能起重要作用。

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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Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP '93)

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