Temperature and trap distribution dependence of electrical tree growth characteristics in polypropylene/elastomer blends for recyclable cable insulation

Gao, Yu; Li, Jing; Han, Tao; Yuan, Yanqiu; Huang, Shihao; Liu, Yong

doi:10.1049/iet-smt.2018.5382

Cited by 10 publications

(10 citation statements)

References 40 publications

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“…With the addition of PBE or EOC into the PP matrix, the impact resistance is improved as compared with that of PP [27]. The material becomes easier to deform when suffers from energetic particle bombardment from the PD [44], thus the molecular chain can transfer the energy obtained from the bombardment, by which the rupture of the molecular chain is mitigated. Accordingly, the resistance to PD is improved by the elastomer.…”

Section: Discussionmentioning

confidence: 99%

Improvement of partial discharge resistance of polypropylene under AC voltage by blending elastomer

Gao

Peng²,

Zheng

et al. 2022

IET Science Measure & Tech

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This paper reports on the partial discharge (PD) erosion characteristics of polypropylene (PP)/elastomer blends where ethylene‐octene copolymer elastomer (EOC) and propylene‐based elastomer are involved. The PD erosion is performed through a pair of needle‐to‐plane electrodes by applying 5 kV AC voltage for 2 h. A high‐frequency current transformer, optical recorder, and ozone sensor are used to capture the information released during the PD erosion process. In addition, a 3D optical profilometer is employed to record the erosion profile, from which the erosion depth and the surface roughness can be extracted. Carrier trap distribution is derived from the isothermal surface potential decay measurement. The influences of elastomer type and content on the PD resistance are analyzed. The results show that the resistance is improved with the addition of elastomer, and the blend containing EOC of 20 wt% has the best PD resistance among all samples, which is 61.9% higher than that of the pure PP. It is proposed that the carrier trap characteristics, the property of elastomer, and the free volume in the material play important roles in the improvement of the PD resistance. This work provides a potential method to enhance the PD resistance of PP by blending elastomer with proper type and content.

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Section: Discussionmentioning

confidence: 99%

Improvement of partial discharge resistance of polypropylene under AC voltage by blending elastomer

Gao

Peng²,

Zheng

et al. 2022

IET Science Measure & Tech

Self Cite

View full text Add to dashboard Cite

show abstract

“…The corrosion channel formed in the damaged area is called 'electrical treeing'. When the electrical tree channel inside the insulation material reaches the opposite electrode after a long development period, it will cause insulation failure and seriously affect the safe and stable operation of electrical equipment [8][9]. Therefore, the research on inhibiting the initiation and growth of electrical trees in insulating materials has attracted significant attention.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of electrical tree morphological in glass fibre reinforced epoxy resin under power frequency voltage

Wang

Huang

Zhang

et al. 2022

IET Science Measure & Tech

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To study the influence of the arrangement of glass fibres on the growth morphology of electric dendrites, this paper conducted experiments on the initiation and cultivation of electric dendrites on insulation specimens with different glass fibre arrangements. The experimental results show that when the electric field is parallel to the glass fibres, the electric dendrites show linear growth with multiple branches; when the electric field is perpendicular to the glass fibres, the electric dendrites show aggregated growth. The analysis suggests that when the applied electric field is parallel to the glass fibre, to release the discharge energy in the main channel of the dendrite, the discharge in the track of the electric dendrite will drive the electric dendrite to grow along the interface area between the glass fibre and the epoxy resin. When the externally applied electric field is perpendicular to the glass fibre, the discharge within the electric dendrite discharge channel is high. To release the energy in the electrical tree channel, the blast in the electrical tree track induces the electrical tree branch to grow along the interface area and forward.

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“…Polyolefin elastomers (POE), copolymerized with ethylene and an α‐olefin, are one of the most commonly used toughening materials due to their excellent toughness and stiffness 3 . The toughening effect is related to the type 4–6 and dosage 7–11 of POE, the molecular weight and its distribution of PP, 12,13 as well as the crystalline structure of PP 14–16 . For example, Wang et al 4 evaluated the effect of the POE type (ethylene/1‐octene random copolymer POE8200 and ethylene/propylene copolymer POE6202) on the impact strength of toughened PP, and found that POE6202 toughened specimens had the highest impact strength due to the superior compatibility of PP and POE6202.…”

Section: Introductionmentioning

confidence: 99%

Realizing simultaneous high‐temperature strength and low‐temperature elongation in polyolefin elastomer toughened polypropylene via controlling the dispersed phase size

Chen

Cao

Guo

et al. 2022

J of Applied Polymer Sci

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The properties of modified polypropylene (PP) materials are closely related to their phase structure. In this work, polyolefin elastomer (POE)-toughened PP materials with different phase structures were designed by using various types of POEs (ethylene-butene 710, 110, ethylene-propylene 6202, ethylene-octene 8200). Then, the effects of phase separation in PP/POE blends on both thermal and tensile properties as well as ultraviolet (UV) resistance were investigated. The results revealed that the POE type hardly affected the melt flow rate, melting or crystallization behavior of the modified PP samples. Moreover, scanning electron microscopy results showed that POE6202 had a smaller dispersed phase size in PP (0.1-0.5 μm), which improved the low-temperature elongation at break. PP/POE110 blends with a larger microdomain (1-5 μm) had better high-temperature tensile strength. Further, when toughened with POE110 and POE6202 simultaneously, modified PP had excellent low-temperature elongation (272%@ À40 C) without sacrificing as much of its high-temperature tensile strength (10.4 MPa@70 C). Finally, Electron Paramagnetic Resonance tests showed that the addition of amorphous POE decreased the intensity of free radicals generated in PP during irradiation and promoted their attenuation during decay. This indicated that the introduction of POE improved the UV resistance of PP.phase structure, polyolefin elastomer, polypropylene, tensile properties, UV resistance | INTRODUCTIONPolypropylene (PP) is an inexpensive versatile commercial thermoplastic with high rigidity and excellent chemical resistance. 1 However, its poor impact performance and low-temperature brittleness 2 limit its industrial application. Polyolefin elastomers (POE), copolymerized with ethylene and an α-olefin, are one of the most commonly used toughening materials due to their excellent toughness and stiffness. 3 The toughening effect is related to the type 4-6 and dosage [7][8][9][10][11] of POE, the molecular weight and its distribution of PP, 12,13 as well as the crystalline structure of PP. [14][15][16] For example, Wang et al. 4 evaluated the effect of the POE type (ethylene/1-octene random copolymer POE8200 and ethylene/propylene copolymer POE6202) on the impact strength of toughened PP, and found that

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Temperature and trap distribution dependence of electrical tree growth characteristics in polypropylene/elastomer blends for recyclable cable insulation

Cited by 10 publications

References 40 publications

Improvement of partial discharge resistance of polypropylene under AC voltage by blending elastomer

Improvement of partial discharge resistance of polypropylene under AC voltage by blending elastomer

Characteristics of electrical tree morphological in glass fibre reinforced epoxy resin under power frequency voltage

Realizing simultaneous high‐temperature strength and low‐temperature elongation in polyolefin elastomer toughened polypropylene via controlling the dispersed phase size

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