High improvement in trap level density and direct current breakdown strength of block polypropylene by doping with a β-nucleating agent

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

doi:10.1063/1.5020736

Cited by 21 publications

(22 citation statements)

References 26 publications

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“…It was also found that the trap energies of neat PP, polypropylene/propylene-ethylene copolymer, and polypropylene/ethylene-octene copolymer samples were measured to be around 0.87 eV [19]. In addition, through conduction current measurement trap energy of neat block polypropylene was calculated to be around 0.92 eV [23]. The relaxation time constant τ 0 of relaxation process α changes with the loading, which is 5.79 × 10 −9 s at 0 wt %, 1.20 × 10 −8 s at 0.5 wt %, 7.10 × 10 −9 s at 1.0 wt %, and 6.20 × 10 −9 s at 2.0 wt %.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental results measured by PEA method indicated that under high electric fields homo space charges can accumulate in the bulk of PP dielectric material [9,19,20,23]. The accumulation of space charges results in the distortion of electric field.…”

Section: Resultsmentioning

confidence: 99%

“…The accumulation of space charges results in the distortion of electric field. The accumulation of homo space charges leads to a decrease in electric fields near the interfaces between the dielectric material and its electrodes and an increase in electric fields in the middle of bulk [9,19,20,23]. It was also reported that the accumulation of space charges increases and electric field distortion is much severer with an increase in the applied electric field [20].…”

Section: Resultsmentioning

confidence: 99%

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Carrier Transport and Molecular Displacement Modulated dc Electrical Breakdown of Polypropylene Nanocomposites

Min

Yan

et al. 2018

Polymers

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Dielectric energy storage capacitors have advantages such as ultra-high power density, extremely fast charge and discharge speed, long service lifespan and are significant for pulsed power system, smart power grid, and power electronics. Polypropylene (PP) is one of the most widely used dielectric materials for dielectric energy storage capacitors. It is of interest to investigate how to improve its electrical breakdown strength by nanodoping and the influencing mechanism of nanodoping on the electrical breakdown properties of polymer nanocomposites. PP/Al2O3 nanocomposite dielectric materials with various weight fraction of nanoparticles are fabricated by melt-blending and hot-pressing methods. Thermally stimulated current, surface potential decay, and dc electrical breakdown experiments show that deep trap properties and associated molecular chain motion are changed by incorporating nanofillers into polymer matrix, resulting in the variations in conductivity and dc electrical breakdown field of nanocomposite dielectrics. Then, a charge transport and molecular displacement modulated electrical breakdown model is utilized to simulate the dc electrical breakdown behavior. It is found that isolated interfacial regions formed in nanocomposite dielectrics at relatively low loadings reduce the effective carrier mobility and strengthen the interaction between molecular chains, hindering the transport of charges and the displacement of molecular chains with occupied deep traps. Accordingly, the electrical breakdown strength is enhanced at relatively low loadings. Interfacial regions may overlap in nanocomposite dielectrics at relatively high loadings so that the effective carrier mobility decreases and the interaction between molecular chains may be weakened. Consequently, the molecular motion is accelerated by electric force, leading to the decrease in electrical breakdown strength. The experiments and simulations reveals that the influence of nanodoping on dc electrical breakdown properties may origin from the changes in the charge transport and molecular displacement characteristics caused by interfacial regions in nanocomposite dielectrics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Carrier Transport and Molecular Displacement Modulated dc Electrical Breakdown of Polypropylene Nanocomposites

Min

Yan

et al. 2018

Polymers

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“…MPS-treated samples show higher AC breakdown strength than the C8 samples, and this can be related to the presence of b-crystal in MPS samples (Fig. 7) [43]. After 9-day water immersion, a significant (* 35 kV/mm) reduction in the AC breakdown of non-treated systems can be observed (Fig.…”

Section: Ac Breakdown Strengthmentioning

confidence: 87%

Effect of water on the breakdown and dielectric response of polypropylene/nano-aluminium nitride composites

et al. 2020

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The influence of water immersion and silane treatment on the AC breakdown and the complex dielectric response of polypropylene/nano-aluminium nitride (PP/nano-AlN) composites has been investigated. The as-received filler was examined to have a nanoscale particle distribution with a hexagonal shape and slight hydrolysation. Grafting the aluminium nitride with an octyl silane reduces the weight increase in samples filled with 10 wt% of aluminium nitride during water immersion by 3, from 0.29 to 0.09%. The results suggest that the AC breakdown strength and complex permittivity of ''wet'' composite samples are related to the silane treatment of the nanofiller. The AC breakdown strength of octyl silane-treated samples after 9 days of water immersion shows comparable results to the dry samples, while a reduction can be seen on non-treated samples. Although silane-treated samples still show an increased dielectric loss at low frequency after water immersion, a significant reduction in low-frequency dispersion of real and imaginary permittivity can be seen when compared to the non-treated composites. This indicates that significant gains can be obtained for PP/nano-AlN composites by suitable silane treatments.

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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: 80%

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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High improvement in trap level density and direct current breakdown strength of block polypropylene by doping with a β-nucleating agent

Cited by 21 publications

References 26 publications

Carrier Transport and Molecular Displacement Modulated dc Electrical Breakdown of Polypropylene Nanocomposites

Carrier Transport and Molecular Displacement Modulated dc Electrical Breakdown of Polypropylene Nanocomposites

Effect of water on the breakdown and dielectric response of polypropylene/nano-aluminium nitride composites

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

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