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Open AccessArticle

Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene

1
State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
2
State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
3
School of Electrical Engineering, Xinjiang University, Urumqi 830047, China
4
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
5
Department of Chemical and Biomolecular Engineering, NYU Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA
*
Author to whom correspondence should be addressed.
Polymers 2018, 10(4), 406; https://doi.org/10.3390/polym10040406
Received: 10 February 2018 / Revised: 29 March 2018 / Accepted: 3 April 2018 / Published: 5 April 2018
(This article belongs to the Special Issue Phase Behavior in Polymers)
Adding nucleating agents (NAs) is one of the most efficient ways to obtain improved mechanical, optical, and thermal properties of isotactic polypropylene (iPP). While it is well appreciated that electrical property is critically affected by crystalline modification, the role between them remains unclear. Here, we address this issue by incorporating commercial α-NA and β-NA into iPP, both of which exhibit strong nucleation ability, e.g., reducing the size of crystalline agglomerates from 45.3 μm (Pure-iPP) to 2.5 μm (α-iPP) and 7.6 μm (β-iPP), respectively. Mechanical testing results show that while β-modification decreases the tensile strength a little, it does enhance the elongation at break (200%) and toughness (25.3% higher), relative to its unfilled counterparts. Moreover, a well-dispersed β-iPP system obtains a comprehensive improvement of electrical properties, including dielectric breakdown strength, space charge suppression, and internal field distortion under a high external field (−100 kV/mm) due to newly-generated deep charge trapping sites. This crystalline modification strategy is attractive for future development of many engineering insulating polymers. View Full-Text
Keywords: isotactic polypropylene; nucleating agent; crystalline modification; impact strength; dielectric breakdown strength; space charge isotactic polypropylene; nucleating agent; crystalline modification; impact strength; dielectric breakdown strength; space charge
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MDPI and ACS Style

Zhang, L.; Zhang, Y.; Zhou, Y.; Teng, C.; Peng, Z.; Spinella, S. Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene. Polymers 2018, 10, 406.

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