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Effect of Phase Change on Space Charge and DC Breakdown Characteristics of Polylactic Acid
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Ke LI1, Yuanxiang ZHOU1, 2, Yunxiao ZHANG2, Ling ZHANG2, Chenyuan TENG2, 3
Insulating Materials | 2021, 54(1) : 66 - 72
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Insulating Materials | 2021, 54(1): 66-72
• Test and Analysis •
Effect of Phase Change on Space Charge and DC Breakdown Characteristics of Polylactic Acid
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Ke LI1, Yuanxiang ZHOU1, 2, Yunxiao ZHANG2, Ling ZHANG2, Chenyuan TENG2, 3
Affiliations
  • 1The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Xinjiang University, Urumqi 830047, China
  • 2State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
  • 3School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
Published: 2021-01-20 doi: 10.16790/j.cnki.1009-9239.im.2021.01.012
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In order to study the influence of phase change on the space charge characteristic and electric strength of polylactic acid (PLA), we prepared PLA samples and studied their physical and chemical properties, conduction current, space charge, and electric strength. The results show that the phase change (glass transition) temperature of PLA is 59℃, and before and after the phase change, the PLA nucleates and the unite cell grows, respectively. As a result, the conductivity of PLA first increases then decreases and increases again with the increase of temperature. More shallow interface traps are introduced in the phase transition process, resulting in the average trap depth of PLA decreases with the increase of temperature. Before and after phase change, PLA is in glass state and rubber state, respectively. When the temperature increases by 20℃, the electric strength of PLA in glass state decreases by 12%, while the electric strength of PLA in rubber state decreases by 40%.

polylactic acid (PLA)  /  environment-friendly material  /  phase change  /  space charge  /  electric strength
Ke LI, Yuanxiang ZHOU, Yunxiao ZHANG, Ling ZHANG, Chenyuan TENG. Effect of Phase Change on Space Charge and DC Breakdown Characteristics of Polylactic Acid[J]. Insulating Materials, 2021 , 54 (1) : 66 -72 . DOI: 10.16790/j.cnki.1009-9239.im.2021.01.012
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.01.012
  • Receive Date：2020-03-25
  • Online Date：2026-01-26
  • Published：2021-01-20
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History
  • Received：2020-03-25
  • Revised：2020-05-09
Funding
Affiliations
    1The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Xinjiang University, Urumqi 830047, China
    2State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
    3School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2021.01.012
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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