退火速率对环保型聚乳酸材料直流击穿和电导电流特性的影响

doi:10.19595/j.cnki.1000-6753.tces.191408

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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 words： Poly-lactic acid (PLA) environmentally friendly material annealing rate DC breakdown conduction current

Received: 25 October 2019

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TM215

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	Li Ke
	Zhang Yunxiao
	Zhou Yuanxiang
	Zhang Ling
	Teng Chenyuan

Cite this article:

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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