| Effects of Gamma-Ray Irradiation on Dielectric Surface Breakdown of Polybutylene Naphthalate and Polybutylene Terephthalate Under Reduced Pressure |
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| 作者姓名： | 杜伯学 刘弘景 刘勇 孟令飞 |
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| 作者单位： | School of Electrical Engineering and Automation Tianjin University，School of Electrical Engineering and Automation Tianjin University，School of Electrical Engineering and Automation Tianjin University，School of Electrical Engineering and Automation Tianjin University，Tianjin 300072 China，Tianjin 300072 China，Tianjin 300072 China，Tianjin 300072 China |
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| 基金项目： | 教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | A dielectric breakdown phenomenon on polymer sur-faces calledtrackingfailure was observed1].Itis caused bycarbonized conductive tracks formed on their surfaces .Whensufficientlyintensive discharge lasted for a consider-abletime ,the decomposedcarbon prod…
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| 关 键 词： | 聚丁烯 对苯二酸 大气压 气象 |
| 修稿时间： | 2007-03-07 |
Effects of Gamma-Ray Irradiation on Dielectric Surface Breakdown of Polybutylene Naphthalate and Polybutylene Terephthalate Under Reduced Pressure |
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| DU Boxue,LIU Hongjing,LIU Yong,MENG Lingfei.Effects of Gamma-Ray Irradiation on Dielectric Surface Breakdown of Polybutylene Naphthalate and Polybutylene Terephthalate Under Reduced Pressure[J].Transactions of Tianjin University,2007,13(4):247-253. |
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| Authors: | DU Boxue LIU Hongjing LIU Yong MENG Lingfei |
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| Institution: | School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China |
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| Abstract: | With the increasing application of electric and electronic devices in space and nuclear power stations, the polymeric insulation materials are inevitably exposed to various kinds of environments. Accordingly, it becomes necessary to investigate the effects of the radiation and air pressure on insulation materials. This paper describes the effects of gamma-ray irradiation and reduced pressure on dielectric breakdown of polybutylene naphthalate (PBN) and polybutylene terephthalate (PBT) by applying a DC pulse voltage. Both PBN and PBT were irradiated in air up to 100 kGy and then up to 1 000 kGy with a dose rate of 10 kGy/h by using a60Co gamma-source. The effects of total dose and reduced pressure on the time to dielectric breakdown and discharge quantity were discussed. Obtained results show that, while increasing the total dose, the discharge quantity decreased with PBN, but increased with PBT. With decreasing the air pressure, the discharge quantity increased with PBN, but decreased with PBT. With increasing the total dose, the time to dielectric breakdown increased with PBN, but decreased with PBT. With decreasing the air pressure, the time to dielectric breakdown increased with both PBN and PBT. The experimental results suggest that the chemical structure of polybutylene polymers plays a main role in the result of radiation reaction, which is related to cross-linking and degradation reaction. |
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| Keywords: | polybutylene naphthalate (PBN) polybutylene terephthalate (PBT) air pressure total dose gamma-ray irradiation discharge quantity dielectric breakdown cross-linking degradation |
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