β成核剂含量对等规聚丙烯电导电流和空间电荷特性的影响

doi:10.19595/j.cnki.1000-6753.tces.L80042

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Abstract β-nucleating agents (NAs) are widely used to regulate the phase transition behavior of polypropylene. To study the influence of β-NA content on conduction current and space charge characteristics in isotactic polypropylene (iPP), iPP samples filled with different mass fractions of substituted aromatic heterocyclic phosphate β-NAs (TMB-5) were prepared. Experiments of conduction current, dielectric, and space charge under temperature fields were carried out. The results show that β-crystal content increases firstly and then decreases with the increase of β-NA content, while conduction current is opposite. Moreover, electric field distortion ratio of six groups of iPP samples are no larger than 6% under -100 MV/m at 25℃ for 30 min of polarization. On the other hand, positive charge accumulates near the cathode in all groups under -100 MV/m at 70℃ for 30 min of polarization, and electric field distortion ratio of pure iPP samples is the largest (36.7%), while that of iPP-β0.1% (containing 0.1% β-NAs) is only 13.9%. Combining polarized optical microscopy observations with statistics of the average size of crystallite clusters, cause for the changes of β-crystal content was analyzed from the dispersion and nucleation processes of β-NAs. Utilizing measurement results of space charge during polarization and depolarization processes, influence of β-NA content on the charge transit and distribution processes was explained based on the correlation between the microstructure and internal traps of materials.

Key words： Isotactic polypropylene phase transition behavior β-nucleating agent; conduction current space charge

Published: 17 April 2019

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TM21

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	Peng Zhaowei
	Guan Yonggang
	Zhang Ling
	Zhou Yuanxiang
	Sha Yanchao

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Peng Zhaowei,Guan Yonggang,Zhang Ling等. Influence of ??-Nucleating Agent Content on Conduction Current and Space Charge Characteristics in Isotactic Polypropylene[J]. Transactions of China Electrotechnical Society, 2019, 34(7): 1527-1535.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80042 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I7/1527

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