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

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          Abstract

          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.

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          Structure and properties of isotactic polypropylene

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            β-MODIFICATION OF ISOTACTIC POLYPROPYLENE: PREPARATION, STRUCTURE, PROCESSING, PROPERTIES, AND APPLICATION

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              Molecular modeling of electron trapping in polymer insulators

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                Author and article information

                Journal
                Polymers (Basel)
                Polymers (Basel)
                polymers
                Polymers
                MDPI
                2073-4360
                05 April 2018
                April 2018
                : 10
                : 4
                : 406
                Affiliations
                [1 ]State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China; zhangling15@ 123456tsinghua.edu.cn (L.Z.); zhangyxthu@ 123456gmail.com (Y.Z.); pzw16@ 123456mails.tsinghua.edu.cn (Z.P.)
                [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; tengchenyuan@ 123456126.com
                [5 ]Department of Chemical and Biomolecular Engineering, NYU Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA; sgaluf@ 123456gmail.com
                Author notes
                [* ]Correspondence: zhou-yx@ 123456tsinghua.edu.cn ; Tel.: +86-10-6277-2122
                Article
                polymers-10-00406
                10.3390/polym10040406
                6415251
                3ae69c48-f935-49bc-86eb-3f0029c97992
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 10 February 2018
                : 03 April 2018
                Categories
                Article

                isotactic polypropylene,nucleating agent,crystalline modification,impact strength,dielectric breakdown strength,space charge

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