Dielectric properties of alumina-filled poly (ethylene-co-butyl acrylate) nanocomposites Part II- wet studies

Jäverberg, Nadejda; Edin, Hans; Nordell, Patricia; Nawaz, Sohail; Hillborg, Henrik; Azhdar, Bruska; Gedde, Ulf W.

doi:10.1109/tdei.2012.6180230

Cited by 16 publications

(14 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As determined in the earlier study [8,9] the dielectric constant for the materials is approximately 2.1, which determines the polarization current density: , which is comparable to the determined DC offset level. Note that no direct correlations were established between the testing order of the samples and breakdown strength and/or measured current.…”

Section: Measurement Setupsupporting

confidence: 70%

“…All the current measurements were performed simultaneously with the breakdown strength testing; hence, the thorough description of the sample preparation and conditioning can be found in [8,9]; see Figure 2 for the measurement circuit. Twenty samples with a diameter of 3 cm and approximate thickness of 140 μm were produced.…”

Section: Sample Preparation and Conditioningmentioning

confidence: 99%

“…NDO materials were chosen due to very good results in particle dispersion in the base matrix and also the consistent measurement results from dielectric spectroscopy measurements [8][9][10]. Two samples were tested per each of the above mentioned materials.…”

Section: Time [S] Current Through the Sample [A]mentioning

confidence: 99%

“…Two different surface modifications were investigated in an attempt to understand its influence on dispersion and material properties. In a previous study [8][9][10] it was shown that nanocomposites with filler content of 6 wt% had best dispersion among the compositions manufactured and this study is therefore limited to mostly 6 wt% filler content. In order to see the trend for a different filler content two samples per material filled with 2 and 12 wt% of octyltreated ND alumina were included in the study as well.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Prebreakdown current and DC breakdown strength of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites: Part II - prebreakdown currents

Jaeverberg

Venkatesulu

Edin

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

Pre-breakdown currents through the poly (ethylene-co-butyl acrylate) (EBA) nanocomposites filled with spherical alumina particles were studied as a function of particle coating and moisture content. The nanocomposites were prepared from a mixture of EBA formulations (13 wt% butyl acrylate groups content) and alumina powder. Two kinds of alumina nanoparticles were used: NA (25 nm in diameter) and ND (45 nm in diameter). The particles were either unmodified or surface-treated with aminopropyltriethoxy silane or octyltriethoxy silane. Two different relative humidities of air were used for conditioning the samples prior to testing: 0 % RH (dry case) and 86 % RH (samples were saturated with moisture). The pre-breakdown current measurements were performed with a DC ramp of 1.2 kV/s. Twenty samples were tested for each material formulation -ten of which were tested in dry conditions and ten were tested after conditioning in humid environment. Results were compared to the reference unfilled EBA samples. The measured currents were analyzed under the assumption of space charge limited conduction. As expected, conditioning materials in humid environment caused an increase in pre-breakdown currents. This effect was more pronounced for nanocomposite materials, while the reference unfilled material was least affected.

show abstract

Section: Measurement Setupsupporting

confidence: 70%

Section: Sample Preparation and Conditioningmentioning

confidence: 99%

Section: Time [S] Current Through the Sample [A]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prebreakdown current and DC breakdown strength of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites: Part II - prebreakdown currents

Jaeverberg

Venkatesulu

Edin

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Due to time limitations only a filler content of 6 wt% was studied, two measurements per material filled with 2 and 12 wt% of ND nanoparticles with octyl coating (NDO) were also performed in order to probe a possible trend due to filler content. NDO materials were chosen based on an earlier study [7,8], where these materials proved to be the most homogenous of the entire experimental matrix. In this paper the nanocomposites were studied with the help of a short-term DC ramp test.…”

Section: Introductionmentioning

confidence: 99%

Prebreakdown current and dc breakdown strength of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites: Part I - breakdown strength

Jaeverberg

Venkatesulu

Edin

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

Dielectric breakdown strength of poly (ethylene-co-butyl acrylate) (EBA)nanocomposites filled with spherical alumina particles was studied as a function of particle coating, moisture content and the effective specific surface area. Two kinds of alumina nanoparticles were used: NA (25 nm in diameter) or ND (45 nm in diameter). The particles were either unmodified or surface-treated with aminopropyltriethoxy silane or octyltriethoxy silane. Two different relative humidities of air were used for conditioning the samples prior to testing: 0 % RH (dry case) and 86 % RH (samples were saturated with moisture). The dielectric breakdown strength measurements were performed with a DC ramp of 1.2 kV/s. Twenty samples were tested for each material formulation -ten of which were tested in dry conditions and ten were tested after conditioning in humid environment. Results were compared to the reference unfilled EBA samples. Applying Weibull analysis to the measured breakdown voltages indicated that the material filled with amino-coated ND particles exhibited the highest breakdown strength under dry conditions. As expected, conditioning materials in a humid environment had a negative impact on breakdown strength. This effect was more pronounced for nanocomposite materials, compared to the unfilled reference material.

show abstract

The Role of Interfaces in Polyethylene/Metal‐Oxide Nanocomposites for Ultrahigh‐Voltage Insulating Materials

2017

View full text Add to dashboard Cite

Recent progress in the development of polyethylene/metal-oxide nanocomposites for extruded high-voltage direct-current (HVDC) cables with ultrahigh electric insulation properties is presented. This is a promising technology with the potential of raising the upper voltage limit in today's underground/submarine cables, based on pristine polyethylene, to levels where the loss of energy during electric power transmission becomes low enough to ensure intercontinental electric power transmission. The development of HVDC insulating materials together with the impact of the interface between the particles and the polymer on the nanocomposites electric properties are shown. Important parameters from the atomic to the microlevel, such as interfacial chemistry, interfacial area, and degree of particle dispersion/aggregation, are discussed. This work is placed in perspective with important work by others, and suggested mechanisms for improved insulation using nanoparticles, such as increased charge trap density, adsorption of impurities/ions, and induced particle dipole moments are considered. The effects of the nanoparticles and of their interfacial structures on the mechanical properties and the implications of cavitation on the electric properties are also discussed. Although the main interest in improving the properties of insulating polymers has been on the use of nanoparticles, leading to nanodielectrics, it is pointed out here that larger microscopic hierarchical metal-oxide particles with high surface porosity also impart good insulation properties. The impact of the type of particle and its inherent properties (purity and conductivity) on the nanocomposite dielectric and insulating properties are also discussed based on data obtained by a newly developed technique to directly observe the charge distribution on a nanometer scale in the nanocomposite.

show abstract

Dielectric properties of alumina-filled poly (ethylene-co-butyl acrylate) nanocomposites Part II- wet studies

Cited by 16 publications

References 5 publications

Prebreakdown current and DC breakdown strength of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites: Part II - prebreakdown currents

Prebreakdown current and DC breakdown strength of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites: Part II - prebreakdown currents

Prebreakdown current and dc breakdown strength of alumina-filled poly(ethylene-co-butyl acrylate) nanocomposites: Part I - breakdown strength

The Role of Interfaces in Polyethylene/Metal‐Oxide Nanocomposites for Ultrahigh‐Voltage Insulating Materials

Contact Info

Product

Resources

About