Enhanced Electrical Properties of Polyethylene-Graft-Polystyrene/LDPE Composites

Song, Shuwei; Zhao, Hong; Yao, Zhanhai; Yan, Zhiyu; Yang, Jiaming; Wang, Xuan; Zhao, Xin

doi:10.3390/polym12010124

Cited by 11 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the electric field is increased to this level, negative charges can be easily injected from the cathode, while there is an insignificant positive charge injection at the anode. Similar phenomena have been widely reported with different types of polymers, such as polyethylene [18], epoxy resin [19], and polyethylene-graft-polystyrene/LDPE composites [20]. In general, the higher mobility of electrons compared to holes under electric field has been cited as main reason [18].…”

Section: Space Charge Behaviour At 50 Kv/mmsupporting

confidence: 81%

Space Charge Behavior of Quantum Dot-Doped Polystyrene Polymers

Lei

Fabiani

Bray

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

This paper deals with the role played by the interface and bulk volume of the nanofiller about affecting the electrical properties of a nanocomposite material. For this purpose, a simple and completely amorphous matrix, polystyrene (PS), is used as base material, and core-shell quantum dots are exploited for simulating the structure of nanocomposites: CdSe core and CdSe-ZnS core-shell semiconductor quantum dots (QDs) are added into a PS matrix. The latter is to highlight the effect of the ZnS interface and as contrast to the core material. Dispersion and distribution of QDs are first microscopically observed and optimized, by including isopropyl alcohol in the manufacturing phase as an additional solvent. Among electrical properties the focus is on space charge accumulation, tested by means of the pulsed electroacoustic technique at 10 kV/mm and 50 kV/mm on CdSe and CdSe-ZnS doped PS composites. Results are then compared with a reference PS without QDs. Trap depth and density are also obtained by space charge measurement results. When CdSe QDs are added to PS, the trap density increases with respect to the baseline values measured on the unfilled polymer. In contrast, the ZnS shell around the CdSe core creates an additional trap level with lower trap depth, which increases charge mobility, thus turning homocharge into heterocharge accumulation. Therefore, the surface shell-structure of QD nanocrystals appears to significantly influence the space charge behavior of the nanocomposite, independently of the polymer. Index Termsquantum dot (QD), polystyrene, polymer, space charge, nanocomposites INTRODUCTIONNANOCOMPOSITES have been showing unexpected changes to bulk properties, i.e. permittivity, charge transport behaviour, and the enhancement of key dielectric parameters like the breakdown strength and long-term ageing behaviour (treeing resistance). A number of models attempted to explain the effects observed in nanocomposites, e.g. the electrical double layer model [1], the multi-core model [2], an organic and inorganic composites hybrid network model [3], the polymer chain alignment model [4], the interphase volume model [5], the multi-region structure around spherical nanoparticles [6], the

show abstract

Section: Space Charge Behaviour At 50 Kv/mmsupporting

confidence: 81%

Space Charge Behavior of Quantum Dot-Doped Polystyrene Polymers

Lei

Fabiani

Bray

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

show abstract

“…The breakdown strength relation calculated from the numerical model developed in this study was validated against results obtained from various references [6], [40], [41]. Fig.…”

Section: Breakdown Strength Prediction With Current Profile As Critical Index Figure 8 Relationship Between Log-scale Thickness and Breakmentioning

confidence: 63%

Numerical Prediction of DC Breakdown Characteristics in LDPE With Current Profile as Critical Index

Kim

Lee

2020

IEEE Access

View full text Add to dashboard Cite

Understanding the DC breakdown characteristics of polymeric insulators is essential for stable operation of high-capacity DC electrical equipment. To predict the breakdown characteristics of lowdensity polyethylene (LDPE), we propose a numerical methodology with a new critical index in which the internal current varying with temperature, thickness, and injection barrier height. To evaluate this currentbased index, we applied the fully coupled bipolar charge transport (BCT) and molecular chain displacement (MCD) models to analyze the influence of each variable on breakdown phenomena. The results of this analysis revealed that the amount of space charge accumulation within the insulator has a maximum value at approximately 50 ℃, which corresponds to the known morphological transition temperature of LDPE. The breakdown strength calculated using this numerical model was found to decrease with increasing temperature and thickness. Although injection barrier height at the electrode was found to be negatively correlated with breakdown strength, its effect was not as significant as that of the other variables. The breakdown strength values obtained using this numerical method were found to be in close agreement with values reported in the literature. Based on these results, we newly suggest the physical quantity to predict the breakdown strength, the current relaxation speed, which is the slope of the Boltzmann sigmoid function, as a positively correlated index. Finally, we determined that the breakdown phenomena are initiated when the amount of impact accumulated in the insulator changes discontinuously and analyzed the contribution of factors affecting the breakdown using the Pearson correlation coefficient and the Sobol sensitivity index.

show abstract

“…For each recipe at a certain temperature, breakdown tests were repeated for 20 times and DC breakdown strength was acquired by the applied voltage divided by the thickness. The two-parameter Weibull distribution was used to analyze the results as follows [ 11 , 14 , 15 ]: P f ( E ) = 1 − exp[ − ( E / E 0 ) β ] where P f ( E ) is the cumulative failure probability in %, E is the applied electric field strength in kV·mm −1 , E 0 is the scale parameter, which represents the breakdown strength when the cumulative failure probability equals to 63.2% in kV·mm −1 , and β is the shape parameter, which indicates the dispersion of acquired results. In this study, E 0 is employed to characterize the DC breakdown strength of the composites.…”

Section: Methodsmentioning

confidence: 99%

Section: Dielectric Performance Measurementsmentioning

confidence: 99%

Crosslinking Dependence of Direct Current Breakdown Performance for XLPE-PS Composites at Different Temperatures

Cao

Zhong

et al. 2021

Polymers

View full text Add to dashboard Cite

In this paper, crosslinked polyethylene-polystyrene (XLPE-PS) composites with different degrees of crosslinking were fabricated by using different crosslinking agent contents and their direct current (DC) breakdown performance at 30~90 °C was investigated. Results show that with the increase of the degree of crosslinking, the crystallinity of XLPE-PS composites decreases gradually, but their DC breakdown strength demonstrates an increasing trend at 30~90 °C and the enhancement also increases with the rise of temperature. And as the degree of crosslinking increases, the elastic modulus of XLPE-PS composites is reduced and the loss tangent peak temperature decreases but the peak shifts to a lower value, which reveals the suppression of the relaxation process for crystallites. It is believed that high DC breakdown strength with good temperature stability for XLPE-PS composites with a larger degree of crosslinking is attributable to the presence of PS and suppression in the formation of crystallites due to crosslinking.

show abstract

Enhanced Electrical Properties of Polyethylene-Graft-Polystyrene/LDPE Composites

Cited by 11 publications

References 42 publications

Space Charge Behavior of Quantum Dot-Doped Polystyrene Polymers

Space Charge Behavior of Quantum Dot-Doped Polystyrene Polymers

Numerical Prediction of DC Breakdown Characteristics in LDPE With Current Profile as Critical Index

Crosslinking Dependence of Direct Current Breakdown Performance for XLPE-PS Composites at Different Temperatures

Contact Info

Product

Resources

About