Transactions of China Electrotechnical Society  2020, Vol. 35 Issue (24): 5041-5049    DOI: 10.19595/j.cnki.1000-6753.tces.191408
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Effect of Annealing Rate on DC Breakdown and Conduction Current Characteristics of Environmentally Friendly Poly-Lactic Acid Material
Li Ke1, Zhang Yunxiao2, Zhou Yuanxiang1, 2, Zhang Ling2, Teng Chenyuan2, 3
1. The Wind Solar Storage Division of State Key Lab of Control and Simulation of Power System and Generation Equipment School of Electrical Engineering Xinjiang University Urumqi 830047 China;
2. State Key Lab of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing 100084 China;
3. School of Electrical Engineering Wuhan University Wuhan 430072 China

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Abstract  Poly-lactic acid (PLA) is a biodegradable environmentally friendly polymer material with good insulation properties. In order to study the effect of the annealing rate on the DC breakdown and conduction current characteristics of PLA, PLA samples with three annealing rates were prepared, namely slow-cooled (PLA-S), air-cooled (PLA-A) and ice-water cooled (PLA-W). DC breakdown and conduction current characteristics of PLA were tested at temperature fields. The results show that DC breakdown strength of PLA-S is highest, DC breakdown strength of the three samples decreases when the temperature rises from 30℃ to70℃, and PLA-S decreases slightly, only 16.7%. The conduction current of PLA-S increases with the increase of temperature, and the conductivity of PLA-W and PLA-A shows a rising-decreasing-rising trend. Combined with differential scanning calorimetry and polarized light microscopy, it is found that slow annealing is benefit to the crystallization of PLA, and the crystal cell size is large and the uniformity is good. The crystallinity of PLA-S is up to 50%, and the glass transition temperature is 23.7% higher than PLA-W. PLA-W and PLA-A samples are not completely crystalized, and unit cell growth or nucleation crystallization occur during the rise process of temperature. The increase in crystallinity leads to a rising-decreasing-rising trend in conduction current.
Key wordsPoly-lactic acid (PLA)      environmentally friendly material      annealing rate      DC breakdown      conduction current     
Received: 25 October 2019     
PACS: TM215  
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Li Ke
Zhang Yunxiao
Zhou Yuanxiang
Zhang Ling
Teng Chenyuan
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Li Ke,Zhang Yunxiao,Zhou Yuanxiang等. Effect of Annealing Rate on DC Breakdown and Conduction Current Characteristics of Environmentally Friendly Poly-Lactic Acid Material[J]. Transactions of China Electrotechnical Society, 2020, 35(24): 5041-5049.
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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191408     OR     https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I24/5041
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