基于片晶滑移的水树结晶破坏机理

doi:10.19595/j.cnki.1000-6753.tces.200993

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Abstract In this paper, the crystalline destruction of low density polyethylene (LDPE) caused by water tree was discussed, and a destruction mechanism based on lamella slips was proposed. After 500 hours of accelerated water tree aging on LDPE samples by the water-needle method, the cultivated water trees were observed by scanning electron microscope (SEM). The captured parallel distributed micro-channels are similar to the defects formed by mechanical-stress-caused lamella slip during tensile deformation. Through theoretical analysis, the electro-mechanical stress at the tips of the water tree micro-channels is able to cause the lamella slip. The crystalline parameters of the samples with/without water tree were analyzed by Raman spectroscopy (RS) and differential scanning calorimetry (DSC). The results reveal that the growth of water trees leads to the decrease of crystallinity and the increase of interfacial content, and the amorphous content remains unchanged. Therefore, this paper believes that the crystalline destruction mechanism was proposed based on the lamella slip caused by electro-mechanical stress is the main mechanism of the crystalline destruction.

Key words： Low density polyethylene (LDPE) water tree lamella slips crystalline structure destruction mechanism

Received: 06 August 2020

PACS:

TM215.1

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	Tao Xiantao
	Li Hua
	Fang Tian
	Tang Letian
	Lin Fuchang

Cite this article:

Tao Xiantao,Li Hua,Fang Tian等. Crystalline Destruction Mechanism Caused by Water Tree Based on Lamella Slip[J]. Transactions of China Electrotechnical Society, 2021, 36(12): 2640-2649.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200993 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I12/2640

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