Doping Effect of Graphene Nanoplatelets on Electrical Insulation Properties of Polyethylene: From Macroscopic to Molecular Scale

Jing, Ziang; Liu, Changming; Zhao, Hong; Zhang, Guiling; Han, Baozhong

doi:10.3390/ma9080680

Cited by 19 publications

(13 citation statements)

References 44 publications

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“…Thus, the doping of nanoparticles can introduce a new localized state in the system, which results in the change of trap depth and density [22]. The TSC curve of the non-modified pressboard analyzed by the Gauss multi-peak fitting is shown in Figure 12.…”

Section: Resultsmentioning

confidence: 99%

Experimental Study on Influence of Trap Parameters on Dielectric Characteristics of Nano-Modified Insulation Pressboard

et al. 2017

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In order to study the influence of trap parameters on dielectric characteristics of nano-modified pressboards, pressboards were made using the nano doping method with different nanoparticle components. The dielectric characteristics of the modified pressboards were measured, and the trap parameters were investigated using the thermally stimulated current (TSC) method. The test results indicated that the conductivity initially declined and then rose with the increase of nano-Al2O3 content, whereas it solely rose with the increase of nano-SiC content. Moreover, the conductivity exhibited nonlinear characteristics with the enhancement of electric field stress at high nanoparticle content. The relative permittivity of modified pressboard declines initially and then rises with the increase of nanoparticle content. In addition, the breakdown strength of modified pressboards exhibited a pattern of incline followed by decline with the increase of nano-Al2O3 content, while it always declined with the increase of nano-SiC content. The analysis based on the energy band theory on trap parameters of the constructed multi-core model concludes that the nanoparticle components added in pressboard altered both the depth and density of traps. It is therefore concluded that trap parameters have significant influence on the dielectric characteristics of nano-modified insulation pressboard.

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Section: Resultsmentioning

confidence: 99%

Experimental Study on Influence of Trap Parameters on Dielectric Characteristics of Nano-Modified Insulation Pressboard

et al. 2017

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“…In this case, it is difficult for a polymer chain to wrap around the GNP M25; the interfacial area diminishes and does not contribute to the net packing fraction. It has been shown that the excluded volume of the nanoscale fillers coupled with the configurational entropy of the polymer chain 16 plays an important role in the spatial distribution of nanofillers in polymer matrices [52]. In other words, when the diameter of filler increases, it is difficult the filler to disperse isotropically into the polymer matrix.…”

Section: Melting Behavior Following the Non-isothermal Crystallizatiomentioning

confidence: 99%

“…So far, researchers have mainly focused on the effect of graphene content on the nucleation of thermally conductive high-density polyethylene (HDPE) nanocomposites at small supercooling [5], the functionalization and preparation methods of polyethylene, the improvement of thermal stability [6][7][8][9][10][11][12], and the study of mechanical properties of composites [13,14]. However, there is limited literature available on the effect of graphene size on thermal properties of polyethylene [12,[15][16][17]. In our previous work [17], different size of GNPs was used to examine the non-isothermal crystallization kinetics of HDPE at cooling rates from 0.017 to 0.33 K/s.…”

Section: Introductionmentioning

confidence: 99%

Insights into crystallization and melting of high density polyethylene/graphene nanocomposites studied by fast scanning calorimetry

et al. 2018

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Vourlias, G. (2018). Insights into crystallization and melting of high density polyethylene/graphene nanocomposites studied by fast scanning calorimetry. Polymer Testing, 67,[349][350][351][352][353][354][355][356][357][358] AbstractGraphene nanoplatelets (5 wt.%) with different diameters (5 and 25 x 10 -6 m in diameter, 6 x 10 -9 m in thickness) filled high density polyethylene nanocomposites were prepared by the melt-mixing method and the effect of graphene nanoplatelets on the polymeric matrix are then investigated by X-ray diffraction, polarized light microscopy, differential scanning calorimetry, fast scanning calorimetry, and rheology. Polarized light microscopy revealed that graphene nanoplatelets of 5 x 10 -6 m promote the decrease in the size of the spherical aggregates during crystallization compared to larger nanoplatelets. From rheological measurements, it was found that even though the viscosity of the nanocomposites with increasing filler diameter was increased significantly compared to the neat polymer, the processability of these 2 materials was not affected. Several melting events for neat high-density polyethylene and graphene nanocomposites were observed by fast scanning calorimetry associated with the small imperfect crystals grown at large supercooling, the nucleation efficiency and the diameter size of the filler. The activation energy values versus the relative extent of crystallization revealed that graphene nanoplatelets block the movement of the molecular segments and make crystallization difficult, especially at the final stage of the process. Based on this work, it can be concluded that the nanocomposite with the smaller diameter showed the most enhanced crystallization kinetics as graphene increased the number of nucleation sites, while the larger ones hindered the melted molecules in reaching full isotropization above the melting temperature. determined by conventional DSC (filled symbols) and FSC (open symbols)

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“…Thus, doping low content of CCTO particles does not change the conduction mechanism of composites. Besides, it can be found that the conductivity of 2 vol % CCTO/EPDM is slightly higher than that of EPDM, the improvement in conductivity is shown to be due to the doping CCTO particles that make the change in chain structure in the polymer, where the stretched conformation of polymer chains changes [26,27,28]. Secondly, with the increase of doping content, when the applied electric field E < E th , carriers cannot go through the barrier between the CCTO and EPDM matrix.…”

Section: Resultsmentioning

confidence: 99%

Study on Nonlinear Conductivity of CCTO/EPDM Rubber Composites

Zhao

Zhang

2018

Materials

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Researches of the theories and application of polymer composites with nonlinear conductivity are useful for dealing with the nonuniform electrical fields widely existing in the cable accessory insulation. In the present work, we fabricated CCTO (CaCu3Ti4O12)/EPDM (Ethylene Propylene Diene Monomer) composites and investigated their breakdown strength, dielectric and nonlinear conductivity properties in detail; the microstructures of fillers and composites were characterized by scanning electron microscopy (SEM) and X-ray diffraction. CCTO particles are uniformly dispersed in CCTO/EPDM composites, and the composites showed nonlinear conductivity with electric field changes. When the CCTO particle content is low, the conductivity of CCTO/EPDM composites does not present obvious nonlinearity. However, when CCTO content exceeds 2 vol %, the conductivity experiences a nonlinear change with increasing electric field strength and the threshold field (Eth) of nonlinear conductivity declines with the increase of CCTO contents. In addition, it can be found from experiment and simulation results that 8 vol % CCTO/EPDM exhibit significant nonlinear conductivity and dielectric properties as expected, and homogenizing the electrical field much more effectively. Therefore, this paper offers a preliminary discussion about the variation trend of nonlinear conductivity CCTO/EDPM composites, providing an effective reference to solve the application of nonlinear conductivity materials for cable accessories.

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Doping Effect of Graphene Nanoplatelets on Electrical Insulation Properties of Polyethylene: From Macroscopic to Molecular Scale

Cited by 19 publications

References 44 publications

Experimental Study on Influence of Trap Parameters on Dielectric Characteristics of Nano-Modified Insulation Pressboard

Experimental Study on Influence of Trap Parameters on Dielectric Characteristics of Nano-Modified Insulation Pressboard

Insights into crystallization and melting of high density polyethylene/graphene nanocomposites studied by fast scanning calorimetry

Study on Nonlinear Conductivity of CCTO/EPDM Rubber Composites

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