Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene
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 un...
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doaj-9dba74835bff42a085fb6c0c87b790b52020-11-24T21:29:08ZengMDPI AGPolymers2073-43602018-04-0110440610.3390/polym10040406polym10040406Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic PolypropyleneLing Zhang0Yunxiao Zhang1Yuanxiang Zhou2Chenyuan Teng3Zhaowei Peng4Stephen Spinella5State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, ChinaSchool of Electrical Engineering, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, ChinaDepartment of Chemical and Biomolecular Engineering, NYU Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USAAdding 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.http://www.mdpi.com/2073-4360/10/4/406isotactic polypropylenenucleating agentcrystalline modificationimpact strengthdielectric breakdown strengthspace charge |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ling Zhang Yunxiao Zhang Yuanxiang Zhou Chenyuan Teng Zhaowei Peng Stephen Spinella |
spellingShingle |
Ling Zhang Yunxiao Zhang Yuanxiang Zhou Chenyuan Teng Zhaowei Peng Stephen Spinella Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene Polymers isotactic polypropylene nucleating agent crystalline modification impact strength dielectric breakdown strength space charge |
author_facet |
Ling Zhang Yunxiao Zhang Yuanxiang Zhou Chenyuan Teng Zhaowei Peng Stephen Spinella |
author_sort |
Ling Zhang |
title |
Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene |
title_short |
Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene |
title_full |
Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene |
title_fullStr |
Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene |
title_full_unstemmed |
Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene |
title_sort |
crystalline modification and its effects on dielectric breakdown strength and space charge behavior in isotactic polypropylene |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2018-04-01 |
description |
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. |
topic |
isotactic polypropylene nucleating agent crystalline modification impact strength dielectric breakdown strength space charge |
url |
http://www.mdpi.com/2073-4360/10/4/406 |
work_keys_str_mv |
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