Electrostatic model of LDPE-SiO&lt;inf&gt;2&lt;/inf&gt; nanodielectrics

Ciuprina, Florin; Andrei, Laura; Tomescu, F. M. G.; Pleșa, Ilona; Zaharescu, Traian

doi:10.1109/icsd.2013.6619658

Cited by 9 publications

(9 citation statements)

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“…The first analytical models for estimation the effective permittivity of dielectrics were based on the effective medium theory (EMT), where the interface between the components was not considered [ 75 ]. These models assumed an elementary cell containing a spherical inclusion of an arbitrary radius embedded in a matrix, such as Maxwell–Garnett (MG) model [ 75 ]. Later, MG model was extended with different assumptions to consider the interactions between the different constituents, such as the symmetric Bruggeman model [ 75 ].…”

Section: Polymers and (Nano)fillersmentioning

confidence: 99%

“…These models assumed an elementary cell containing a spherical inclusion of an arbitrary radius embedded in a matrix, such as Maxwell–Garnett (MG) model [ 75 ]. Later, MG model was extended with different assumptions to consider the interactions between the different constituents, such as the symmetric Bruggeman model [ 75 ].…”

Section: Polymers and (Nano)fillersmentioning

confidence: 99%

“…The above analytical and numerical models for predicting the effective permittivity of composite dielectric materials, do not take into account explicitly the electric charge distribution in composites, so this aspect could be one important limitation regarding the use of these models for polymer nanocomposites, in defining their dielectric properties [ 75 ].…”

Section: Polymers and (Nano)fillersmentioning

confidence: 99%

“…Starting from Tanaka’s model, in 2008 an electrostatic 3D model by Ciuprina et al [ 75 ] was proposed in order to analyze the electric field distribution inside and outside of the spherical nanoparticles homogenously dispersed into a polymer matrix. In addition, this model can reveal the impact of the nanoparticles diameter and concentration, the thickness of the interface layers and the permittivity of the nanoparticles and layers on the polymer nanocomposites properties [ 83 ].…”

Section: Polymers and (Nano)fillersmentioning

confidence: 99%

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Properties of Polymer Composites Used in High-Voltage Applications

et al. 2016

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Abstract:The present review article represents a comprehensive study on polymer micro/nanocomposites that are used in high-voltage applications. Particular focus is on the structure-property relationship of composite materials used in power engineering, by exploiting fundamental theory as well as numerical/analytical models and the influence of material design on electrical, mechanical and thermal properties. In addition to describing the scientific development of micro/nanocomposites electrical features desired in power engineering, the study is mainly focused on the electrical properties of insulating materials, particularly cross-linked polyethylene (XLPE) and epoxy resins, unfilled and filled with different types of filler. Polymer micro/nanocomposites based on XLPE and epoxy resins are usually used as insulating systems for high-voltage applications, such as: cables, generators, motors, cast resin dry-type transformers, etc. Furthermore, this paper includes ample discussions regarding the advantages and disadvantages resulting in the electrical, mechanical and thermal properties by the addition of micro-and nanofillers into the base polymer. The study goals are to determine the impact of filler size, type and distribution of the particles into the polymer matrix on the electrical, mechanical and thermal properties of the polymer micro/nanocomposites compared to the neat polymer and traditionally materials used as insulation systems in high-voltage engineering. Properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, erosion resistance, space charge behavior, electric breakdown, tracking and electrical tree resistance, thermal conductivity, tensile strength and modulus, elongation at break of micro-and nanocomposites based on epoxy resin and XLPE are analyzed. Finally, it was concluded that the use of polymer micro/nanocomposites in electrical engineering is very promising and further research work must be accomplished in order to diversify the polymer composites matrices and to improve their properties.

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Section: Polymers and (Nano)fillersmentioning

confidence: 99%

Section: Polymers and (Nano)fillersmentioning

confidence: 99%

Section: Polymers and (Nano)fillersmentioning

confidence: 99%

Section: Polymers and (Nano)fillersmentioning

confidence: 99%

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Properties of Polymer Composites Used in High-Voltage Applications

et al. 2016

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“…Plesa used the multilayer model proposed by Tanaka [16], which considers the matrix-nanoparticle interface formed of three layers with distinct properties, to determine the permittivity values of the interface based on its chemical structure [13]. A structural model of the nanocomposite considering distinct layers of the polymerfiller interface was developed as well as a numerical model for calculating the equivalent relative permittivity based on the energy accumulated if an electric field in the electrostatic regime is established [17][18].…”

Section: Introductionmentioning

confidence: 99%

Structural Model for the Estimation of the Equivalent Permittivity of Nanodielectrics Based on Polyethylene and Epoxy Resins

et al. 2021

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A structural model has been developed in order to calculate the equivalent permittivity of nanocomposites based on low-density polyethylene (LDPE) and epoxy resins (ERs) with inorganic fillers. It was assumed that each nanoparticle was centered in an interfacial region composed of three layers in the case of LDPE-based nanocomposites, and of two layers in the case of ER-based nanocomposites. The model for the estimation of the permittivity has been designed for flat samples of the height g, divided into cubes with the side-length l. Each of these cubes contains eight nanoparticles, which are separated from the polymer matrix by two or three layers. Based on the types and concentrations of dipoles present in the layers, the relative permittivity of each layer of the interface can be calculated. By the employment of a 3D numerical model in COMSOL, implemented by the finite element method associated with a cube, the distribution of the electric field inside a cube can be determined, which yields the values of the equivalent permittivity of the nanocomposites. In order to verify the numerical results, the permittivity of the nanocomposites based on LDPE and ERs with inorganic nanofillers (SiO2 or Al2O3) was determined in laboratory experiments. The results reveal congruent correlation between the computed and the experimentally determined values of the equivalent permittivity of the nanodielectrics.

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