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Improved space charge suppression in PP/SEBS nanocomposites by controlling MgO nanoparticles with abundant surface defects

Improved space charge suppression in PP/SEBS nanocomposites by controlling MgO nanoparticles with abundant surface defects
Improved space charge suppression in PP/SEBS nanocomposites by controlling MgO nanoparticles with abundant surface defects

Polymer nanocomposite dielectrics have received extensive attention in the field of electrical materials and equipment. Studies have shown that the interface region between the nanoparticles and the polymer matrix has an important influence on the properties of nanocomposites. In this paper, MgO nanoparticles with abundant surface defects (C-MgO) containing a highly effective interface are synthesized by surface carbonization. A ternary nanocomposite is prepared by melt blending with polypropylene (PP) and styrene-(ethylene-co-butylene)-styrene tri-block copolymer (SEBS). The results showed that the size of the prepared concave nanoparticles was around 100 nm. The addition of 0.2 phr of C-MgO had the smallest charge accumulation in the PP/SEBS/C-MgO nanocomposites, which greatly reduced the electric field distortion and enhanced the charge release ability. Moreover, the DC breakdown strength was increased to 304 kV/mm, which may be due to the introduction of nanoparticles with high surface vacancy defects which provided deep traps. In addition, C-MgO nanoparticles increased the dielectric permittivity. The tensile strength and elongation at break of PP/SEBS/C-MgO composites were significantly increased, due to the rugged structure of the particles, which acted as dispersion stress centers in the polymer matrix. This work helps to develop environmental polymer nanocomposites and promotes the development and application of flexible high-voltage direct-current technology.

0003-6951
Cheng, Qi
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Zha, Jun Wei
203353bd-40ed-474f-8a83-d0ccdbcb5950
Zhai, Jin Tao
4989eb16-6b83-4b23-8d28-d790b5c0203c
Zhang, Dong Li
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Bian, Xingming
508a9576-c621-455c-8ab7-d41ec27f2692
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Dang, Zhi Min
ca1ea016-32ef-4cf8-96ed-cbc5839b58a6
Cheng, Qi
7b9c21eb-c761-433c-9802-10db7ae0bedc
Zha, Jun Wei
203353bd-40ed-474f-8a83-d0ccdbcb5950
Zhai, Jin Tao
4989eb16-6b83-4b23-8d28-d790b5c0203c
Zhang, Dong Li
e212556d-30a5-4321-9577-eddced0251cb
Bian, Xingming
508a9576-c621-455c-8ab7-d41ec27f2692
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Dang, Zhi Min
ca1ea016-32ef-4cf8-96ed-cbc5839b58a6

Cheng, Qi, Zha, Jun Wei, Zhai, Jin Tao, Zhang, Dong Li, Bian, Xingming, Chen, George and Dang, Zhi Min (2019) Improved space charge suppression in PP/SEBS nanocomposites by controlling MgO nanoparticles with abundant surface defects. Applied Physics Letters, 115 (10), [102904]. (doi:10.1063/1.5123208).

Record type: Article

Abstract

Polymer nanocomposite dielectrics have received extensive attention in the field of electrical materials and equipment. Studies have shown that the interface region between the nanoparticles and the polymer matrix has an important influence on the properties of nanocomposites. In this paper, MgO nanoparticles with abundant surface defects (C-MgO) containing a highly effective interface are synthesized by surface carbonization. A ternary nanocomposite is prepared by melt blending with polypropylene (PP) and styrene-(ethylene-co-butylene)-styrene tri-block copolymer (SEBS). The results showed that the size of the prepared concave nanoparticles was around 100 nm. The addition of 0.2 phr of C-MgO had the smallest charge accumulation in the PP/SEBS/C-MgO nanocomposites, which greatly reduced the electric field distortion and enhanced the charge release ability. Moreover, the DC breakdown strength was increased to 304 kV/mm, which may be due to the introduction of nanoparticles with high surface vacancy defects which provided deep traps. In addition, C-MgO nanoparticles increased the dielectric permittivity. The tensile strength and elongation at break of PP/SEBS/C-MgO composites were significantly increased, due to the rugged structure of the particles, which acted as dispersion stress centers in the polymer matrix. This work helps to develop environmental polymer nanocomposites and promotes the development and application of flexible high-voltage direct-current technology.

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Improved space charge suppression in PP/SEBS nanocomposites by controlling MgO nanoparticles with abundant surface defects - Accepted Manuscript
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Accepted/In Press date: 24 August 2019
e-pub ahead of print date: 6 September 2019
Published date: September 2019

Identifiers

Local EPrints ID: 434792
URI: http://eprints.soton.ac.uk/id/eprint/434792
ISSN: 0003-6951
PURE UUID: 5180a0e3-6cd6-47bd-843b-05707882d818

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Date deposited: 09 Oct 2019 16:30
Last modified: 21 Oct 2019 16:30

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Contributors

Author: Qi Cheng
Author: Jun Wei Zha
Author: Jin Tao Zhai
Author: Dong Li Zhang
Author: Xingming Bian
Author: George Chen
Author: Zhi Min Dang

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