Morphology and crystalline-phase-dependent electrical insulating properties in tailored polypropylene for HVDC cables

Zha, Jun‐Wei; Yan, Hongda; Li, Weikang; Dang, Zhi‐Min

doi:10.1063/1.4969063

Cited by 53 publications

(36 citation statements)

References 17 publications

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“…Zhang et al found that strong orientation is helpful for enhancing electrical breakdown strength . Zha et al found that the presence of β and γ crystal form in PP decreased the conductivity, however, the breakdown strength is decreased …”

Section: Resultsmentioning

confidence: 99%

“…36 Zha et al found that the presence of b and c crystal form in PP decreased the conductivity, however, the breakdown strength is decreased. 37 From the results of structure characterization, it has been shown that the T c , T m , degree of crystallization and the crystal form are almost the same in all samples. However, the morphology and the size of crystal in samples are obviously different.…”

Section: The Relationship Between Electrical Properties and Microstrumentioning

confidence: 89%

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The influence of nano‐PS particle on structure evolution and electrical properties of PP/PS

Guo

Yang

et al. 2018

J Polym Sci B Polym Phys

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The polypropylene‐g‐polystyrene (PP‐g‐PS) copolymers with different grafting ratios are used as compatibilizers to control the size of polystyrene (PS) particles at nanometer scale in polypropylene (PP) matrix. Then the PP/PS insulating nanocomposites (containing 10 wt % PS calculated from PS and PP‐g‐PS) are manufactured. With the increase in grafting ratio of PP‐g‐PS, the size of PS particle is reduced and the interfacial adhesion is enhanced. Meanwhile, the dielectric properties, DC breakdown strength and volume resistivity are increased with the decreasing of PS particle size. The spherulite size of PP is decreased and the boundary between crystals and amorphous regions is blurred or even disappears due to the presence of PS nanoparticles. This evolution of PP structure is attributed to the serious entanglements of PP and PS molecular chains. Finally, the correlation between morphological structure and electrical properties is ultimately established based on the in‐depth understanding of the molecular chain movement, crystal structure, and phase morphology. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 706–717

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Section: Resultsmentioning

confidence: 99%

Section: The Relationship Between Electrical Properties and Microstrumentioning

confidence: 89%

The influence of nano‐PS particle on structure evolution and electrical properties of PP/PS

Guo

Yang

et al. 2018

J Polym Sci B Polym Phys

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“…It can be seen that the greater the lamella thickness and the density of deep traps, the higher the breakdown strength. The dependence of the breakdown strength and lamella thickness has been extensively studied [ 17 , 29 ]. At present, the mainstream view holds that breakdown strength is positively correlated with the lamella thickness.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Morphology-Dependent Tensile Property and Breakdown Strength of Impact Polypropylene Copolymer for Cable Insulation

et al. 2020

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The decrease in electrical properties caused by the toughening of polypropylene (PP) is a difficult problem for the modification of PP used for cable insulation. In this research, an isotactic PP, a cross-linked polyethylene (XLPE) and two impact PP copolymers (IPCs) with an ethylene–propylene rubber phase content of 15 and 30% were prepared to assess the possibility of IPCs to be used as cable insulating material. The tensile properties and breakdown strength were evaluated, meanwhile, the rubber phase content dependence of the crystalline structure, morphology and trap distribution were also investigated. Results show that IPCs with a 15% rubber phase content (IPC15) can achieve the simultaneous improvement of elongation at break and breakdown strength compared with isotactic PP, which can be attributed to the special crystalline structure. According to the results of differential scanning calorimetry (DSC) and FTIR, it is proposed that the lamella thickness of IPC15 is maximal and some ethylene segments exist in PP crystals of IPC15 as crystalline structure defects, which is responsible for this enhanced breakdown strength. The morphology results reveal that rubber microspheres are found to coexist with spherulites, which can promote the relative sliding among lamellas under external force and further results in the increase in the elongation at break.

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“…Therefore, it is necessary to develop new recyclable insulation materials for HVDC cable applications. Polypropylene (PP) which has high melting points and excellent electrical properties is a promising material for HVDC cables . However, its stiffness and brittleness at room temperature is not capable as cable insulation material.…”

Section: Introductionmentioning

confidence: 99%

Effect of trap level density on breakdown strength and space charge distribution of polypropylene/low‐density polyethylene composites

Yan

Zhang

et al. 2019

Polymer Composites

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Polypropylene (PP) as an environmentally friendly insulation material has been paid more attention. It is considered as a potential insulating material to replace cross-linked polyethylene (XLPE) for high voltage direct current (HVDC) applications. In this work, PP and PP/low-density polyethylene (LDPE) composites with different LDPE loading were prepared by melt blending method and the corresponding electrical properties were investigated. Results showed that the addition of LDPE significantly changed the microstructure of PP and the trap density was increased in the composites compared with pure PP. The conduction current of PP/LDPE composites was greater than that of PP. The electrical breakdown strength decreased at low LDPE contents and increased at high contents. Space charge was remarkably suppressed in the blend with 40 wt% LDPE loading. This work indicates that the improvements in the electrical properties, especially the charge transport and space charge suppression in the composites are closely related to the trap level density.

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Morphology and crystalline-phase-dependent electrical insulating properties in tailored polypropylene for HVDC cables

Cited by 53 publications

References 17 publications

The influence of nano‐PS particle on structure evolution and electrical properties of PP/PS

The influence of nano‐PS particle on structure evolution and electrical properties of PP/PS

Enhanced Morphology-Dependent Tensile Property and Breakdown Strength of Impact Polypropylene Copolymer for Cable Insulation

Effect of trap level density on breakdown strength and space charge distribution of polypropylene/low‐density polyethylene composites

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