Space charge behaviors of low-density polyethylene blended with polypropylene copolymer

Zhang, Chao; Mizutani, Teruyoshi; Kaneko, K.; Mori, Toshiyuki; Ishioka, M.

doi:10.1016/s0032-3861(01)00807-2

Cited by 31 publications

(17 citation statements)

References 17 publications

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“…Interfaces between crystalline and amorphous material are thought to be the key factor to generate carrier traps of semicrystalline polymers . There are three main interfaces between crystalline and amorphous material, including lamella and amorphous regions (I), matrix and elastomer (II) and spherulite boundaries (III), as illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Some work has been done on polyethylene and polypropylene as environmental electrical insulation for next generation extruded cables. Previous research on low density polyethylene (LDPE) and its blends, high density polyethylene (HDPE) and its blends and LDPE/HDPE blends indicates that ethylene‐based systems do not have sufficient mechanical properties at high temperature and cannot be operated at temperatures exceeding 90 °C. Isotactic polypropylene (PP), which has superior thermal properties to polyethylene, is a promising material for large‐capacity HVDC power cables.…”

Section: Introductionmentioning

confidence: 99%

“…However, the mechanism of space charge suppression in blend polymers has not yet been unambiguously explained since blending not only changes the morphologies of the individual semicrystalline polymers but also generates the interfaces between different phases of the two polymers. It is widely accepted that space charge behaviour in an insulating polymer is closely related to carrier traps introduced by interfaces between crystalline and amorphous material . The carrier traps existing in the crystalline − amorphous interfaces of polymer blends are a complex function of interfacial types and interfacial area.…”

Section: Introductionmentioning

confidence: 99%

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Large improvement in trap level and space charge distribution of polypropylene by enhancing the crystalline − amorphous interface effect in blends

Dang

et al. 2016

Polym. Int.

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The accumulation of space charge in high voltage direct current cable will bring the insulation to failure; the addition of nanoparticles can markedly improve the space charge distribution characteristics inside the cable insulation, but particle agglomeration and cavitation lead to difficulty in controlling the properties of nanocomposites. In this paper, polypropylene (PP)/propylene-ethylene copolymer (PEC) and PP/ethylene-octene copolymer (EOC) blends were prepared by mechanical blending in order to improve both mechanical properties and space charge distribution. Dynamic mechanical thermal analysis shows that both blends have excellent mechanical properties for recyclable power cable. Pulsed electro-acoustic and thermally stimulated depolarization current tests illustrate that PP/EOC blends significantly decrease space charge accumulation and remarkably increase the trap density in the bulk compared with PP and PP/PEC blends. The increase of the trap density in PP/EOC blends can be explained as the result of the shallow traps introduced by the crystalline − amorphous interface existing in the boundaries of spherulites. The shallow traps can act as hopping sites to improve the transportation of space charges.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large improvement in trap level and space charge distribution of polypropylene by enhancing the crystalline − amorphous interface effect in blends

Dang

et al. 2016

Polym. Int.

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“…This result shows that the enhancement of the surface area of EDLC and the depth of nitrogen's 1s of space charge layer can be achieved by the plasma surface treatment. The charge distribution in EDLC is also spatially uneven, i. e., hetero charge distribution, which is presumed to be caused by migration, polarization, and orientation of electrode materials 12…”

Section: Resultsmentioning

confidence: 99%

“…In this research, we aim to change the state of the surface of the polarized electrode by plasma surface treatment and to improve the characteristics of the polarized electrodes 10. We have applied the pulsed electroacoustic (PEA) method11–15 to observe space charge distributions in EDLC. The PEA method is an established technique used for directly measuring space charge distributions in solid dielectrics.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Carbon Electrode for Electric Double Layer Capacitor

Tashima

Kurosawatsu

Otsubo

et al. 2007

Plasma Process. Polym.

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In this research, spatio‐temporal profiles of positive and negative charges in an electric double layer capacitor (EDLC) which consists of activated carbon, treated by plasma discharges were measured. The plasma type was a high frequency glow discharge and the sample of activated carbon is set in the center of glow discharge. Optimal conditions for plasma surface treatment of activated carbon was examined from 0 to 60 min at 150 °C in nitrogen gas. As a result, nitrogen atom was doped onto the surface layer of the activated carbon. In addition, electron spectroscopy for chemical analysis (ESCA) spectra of nitrogen in the activated carbon was examined. By etching the surface layer of carbon electrode exposed to the plasma, the doped nitrogen atom penetrated about 3 nm of the surface layer of carbon electrode after 60 min of plasma surface treatment.

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High‐temperature creep resistant ternary blends based on polyethylene and polypropylene for thermoplastic power cable insulation

Ouyang

Pourrahimi

Lund

et al. 2021

Journal of Polymer Science

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The impact of a small amount of polystyrene-b-poly(ethylene-co-butylene)-bpolystyrene (SEBS) on the thermomechanical and electrical properties of blends comprising low-density polyethylene (LDPE) and isotactic polypropylene (PP) is investigated. SEBS is found to assemble at the PP:LDPE interface as well as within isolated PP domains. The addition of 10 wt% SEBS significantly increases the storage modulus between the melting temperatures of the two polyolefins, 110 and 160 C, and results in improved resistance to creep during both tensile deformation as well as compression. Furthermore, the ternary blends display a very low direct-current (DC) conductivity as low as 3.4 Â 10 À15 S m À1 at 70 C and 30 kV mm À1 , which is considerably lower than values measured for neat LDPE. The here presented type of ternary blend shows potential as an insulation material for high-voltage direct current power cables.

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Space charge behaviors of low-density polyethylene blended with polypropylene copolymer

Cited by 31 publications

References 17 publications

Large improvement in trap level and space charge distribution of polypropylene by enhancing the crystalline − amorphous interface effect in blends

Large improvement in trap level and space charge distribution of polypropylene by enhancing the crystalline − amorphous interface effect in blends

Surface Modification of Carbon Electrode for Electric Double Layer Capacitor

High‐temperature creep resistant ternary blends based on polyethylene and polypropylene for thermoplastic power cable insulation

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