Exploring the relationship of dielectric relaxation behavior and discharge efficiency of P(VDF-HFP)/PMMA blends by dielectric spectroscopy

Zhao, Xiaojia; Liu, Wenpei; Jiang, Xubo; Liu, Ke; Peng, Guirong; Zhan, Zaiji

doi:10.1088/2053-1591/3/7/075304

Cited by 27 publications

(12 citation statements)

References 41 publications

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“…However, much of the existing understanding of the relationship between attenuation mechanisms and complex permittivity is based on semiempirical rules. Little research has been reported on the quantitative relationship between CaP and permittivity, as well as the preferred dissipation mechanism in different types of dielectrics (e.g., semiconductor/graphitized carbon, graphene, and so on) …”

Section: Introductionmentioning

confidence: 99%

Defect Engineering in Two Common Types of Dielectric Materials for Electromagnetic Absorption Applications

Quan

Shi

Ong

et al. 2019

Adv Funct Materials

533

162

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(1 of 10)Dielectric materials are greatly desired for electromagnetic absorption applications. Lots of research shows that conduction loss and polarization are two of the most important factors determining complex permittivity. However, the detailed dissipation mechanisms for the improved microwave absorption performance are often based on semiempirical rules, lacking practical data relationships between conduction loss/polarization and dielectric behaviors. Here, a strategy of introducing point defects is used to understand such underlying relationships, where polarizability and conductivity are adjustable by manipulating oxygen deficiency or heteroatoms. Based on first principles calculations and the applied oxygendeficient strategy, dielectric polarization is shown to be dominant in determining the permittivity behaviors in semiconductors. Meanwhile, the presented nitrogen doping strategy shows that conduction loss is dominant in determining the permittivity behavior in graphitized carbon materials. The validity of the methods for using point defects to explore the underlying relations between conduction loss/polarization and dielectric behaviors in semiconductor and graphitized carbon are demonstrated for the first time, which are of great importance in optimizing the microwave absorption performance by defect engineering and electronic structure tailoring.

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Section: Introductionmentioning

confidence: 99%

Defect Engineering in Two Common Types of Dielectric Materials for Electromagnetic Absorption Applications

Quan

Shi

Ong

et al. 2019

Adv Funct Materials

533

162

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“…As a result, the relaxation strength (ΔM), activation energy ( E a ), and relaxation time ( τ M ) of the dielectric modulus all increased. In blending, two α relaxation processes occurred that were not Debye relaxation processes [ 126 ].…”

Section: Linear/nonlinear Polymer Dielectricsmentioning

confidence: 99%

Energy Storage Application of All-Organic Polymer Dielectrics: A Review

et al. 2022

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With the wide application of energy storage equipment in modern electronic and electrical systems, developing polymer-based dielectric capacitors with high-power density and rapid charge and discharge capabilities has become important. However, there are significant challenges in synergistic optimization of conventional polymer-based composites, specifically in terms of their breakdown and dielectric properties. As the basis of dielectrics, all-organic polymers have become a research hotspot in recent years, showing broad development prospects in the fields of dielectric and energy storage. This paper reviews the research progress of all-organic polymer dielectrics from the perspective of material preparation methods, with emphasis on strategies that enhance both dielectric and energy storage performance. By dividing all-organic polymer dielectrics into linear polymer dielectrics and nonlinear polymer dielectrics, the paper describes the effects of three structures (blending, filling, and multilayer) on the dielectric and energy storage properties of all-organic polymer dielectrics. Based on the above research progress, the energy storage applications of all-organic dielectrics are summarized and their prospects discussed.

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“…Thus, it is inferred that the sample with 5 wt% content HDPE has the highest molecular chain alignment disorder, looseness, and flexibility, so that molecular chains can easily be The α relaxation is relevant to the movement of molecular segments in amorphous phase [25]. α relaxation is caused by the orientation of the dipoles in the molecular chain under the action of microscopic Brownian motion [26]. The increase in temperature allows the dipoles to obtain enough energy to be aligned under the action of the electric field, thereby increasing the dielectric constant.…”

Section: Dipole Motion Relaxationmentioning

confidence: 99%

“…The α relaxation process is closely related with the dipoles in polymer, which is coincident with the crystallinity of samples. In addition, ∆ε α also depend on the number of dipoles in the amorphous area [26]. Polymer contains more dipoles as well as lower crystallinity have higher ∆ε α .…”

Section: Dipole Motion Relaxationmentioning

confidence: 99%

Coupling Effect of Molecular Chain Displacement and Carrier Trap Characteristics on DC Breakdown of HDPE/LDPE Blend Insulation

Fan

Zhong

2020

Polymers

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This work focuses on the coupling effect of molecular chain displacement and trap characteristics on direct current (DC) breakdown properties of high density/low density polyethylene (HDPE/LDPE) blend insulation. Frequency domain spectroscopy (FDS) and isothermal discharge current (IDC) are used to characterize the dielectric relaxation and trap characteristics of HDPE/LDPE blends. A DC breakdown model is proposed to reveal the mechanisms of the molecular chain displacement and carrier trap on the DC breakdown strength. The dielectric relaxation α and δ present segmental motions and thermal ion polarization behaviours of HDPE/LDPE blends, respectively. α dielectric relaxation strength (Δεα) increases as the amount of HDPE increases from 0 to 5 wt%, and then declines with a further increase of HDPE content to 20 wt%. According to the velocity equation, the increase of Δεα will increase the molecular chain displacement, resulting in a larger free volume, which will provide electrons with larger free path λ to form hot electrons. A positive correlation exists between the activation energy of the dielectric relaxation process δ and trap density, and the increase of δ dielectric relaxation strength (Δεδ) will adversely affect the breakdown strength of the specimen. HDPE/LDPE blends with 15 wt% HDPE content have lower Δεα and lowest Δεδ, which decreases the mean free path λ of molecular chain and thermal ion polarization. At the same time, it has the highest deep trap density, thus increasing the probability of hot electrons being captured and improving the DC breakdown strength. It is concluded the breakdown of the dielectric is synergistically affected by the molecular chain displacement and carrier trap.

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Exploring the relationship of dielectric relaxation behavior and discharge efficiency of P(VDF-HFP)/PMMA blends by dielectric spectroscopy

Cited by 27 publications

References 41 publications

Defect Engineering in Two Common Types of Dielectric Materials for Electromagnetic Absorption Applications

Defect Engineering in Two Common Types of Dielectric Materials for Electromagnetic Absorption Applications

Energy Storage Application of All-Organic Polymer Dielectrics: A Review

Coupling Effect of Molecular Chain Displacement and Carrier Trap Characteristics on DC Breakdown of HDPE/LDPE Blend Insulation

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