Breakdown, free-volume and dielectric behavior of the nanodielectric coatings based on epoxy/metal oxides

Nascimento, Eduardo do; Ramos, Alexandre Moraes; Windmöller, Dario; Rodrigo, Pau Reig; Teruel-Juanes, R.; Ribes‐Greus, A.; Amigó, V.; Coelho, Luci Boa Nova

doi:10.1007/s10854-016-4962-y

Cited by 17 publications

(14 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An increase of volume resistivity of the composites can be attributed to an increase in resistance to injection of the charge carriers and their generation in the internal dielectric structure [41]. Dielectric breakdown phenomena of nanodielectrics is affected mainly due to low quantity of agglomeration at low filler loadings [42]. Some studies [43,44] also shown the changes of relation between the dielectric breakdown and free-volume in polymers.…”

Section: Improvement Of Epoxy Based Composites Insulating Propertiesmentioning

confidence: 99%

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

et al. 2018

View full text Add to dashboard Cite

Composite insulation materials are an inseparable part of numerous electrical devices because of synergy effect between their individual parts. One of the main aims of the presented study is an introduction of the dielectric properties of nanoscale magnesium oxide powder via Broadband Dielectric Spectroscopy (BDS). These unique results present the behavior of relative permittivity and loss factor in frequency and temperature range. Following the current trends in the application of inorganic nanofillers, this article is complemented by the study of dielectric properties (dielectric strength, volume resistivity, dissipation factor and relative permittivity) of epoxy-based composites depending on the filler amount (0, 0.5, 0.75, 1 and 1.25 weight percent). These parameters are the most important for the design and development of the insulation systems. The X-ray diffraction patterns are presented for pure resin and resin with optimal filler amount (1 wt %), which was estimated according to measurement results. Magnesium oxide nanoparticles were also treated by addition of silane coupling agent (γ-Glycidoxypropyltrimethoxysilane), in the case of optimal filler loading (1 wt %) as well. Besides previously mentioned parameters, the effects of surface functionalization have been observed by two unique measurement and evaluation techniques which have never been used for this evaluation, i.e., reduced resorption curves (RRCs) and voltage response method (VR). These methods (developed in our departments), extend the possibilities of measurement of composite dielectric responses related to DC voltage application, allow the facile comparability of different materials and could be used for dispersion level evaluation. This fact has been confirmed by X-ray diffraction analyses.

show abstract

Section: Improvement Of Epoxy Based Composites Insulating Propertiesmentioning

confidence: 99%

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

et al. 2018

View full text Add to dashboard Cite

show abstract

“…After the addition of nanoparticles, there is a clear effect of interfacial polarization. This leave to the slope of permittivity in nanocomposites with A0.4 and Z0.2 is much higher than the neat epoxy 26 . Observing the dielectric losses, it is possible to see a quasi-DC behavior of the samples Z0.2 and A0.4 26 .…”

Section: Interphase Percolationmentioning

confidence: 84%

“…This leave to the slope of permittivity in nanocomposites with A0.4 and Z0.2 is much higher than the neat epoxy 26 . Observing the dielectric losses, it is possible to see a quasi-DC behavior of the samples Z0.2 and A0.4 26 . Quasi-DC conduction process means that charges have limited mobility, in general following tortuous paths, but they can not go through the whole material 27 .…”

Section: Interphase Percolationmentioning

confidence: 84%

“…The multifractal analysis for sample A2.4 indicated a situation near percolation. In the work 26 the quasi-DC effect could not be characterized in sample A2.4, although a smooth relaxation peak is presented, characterizing relaxation attributed to spatial charges. When interphase is percolated, there is, at least, one physical path for conduction through the material besides hopping, this behavior is well known as conductivity-DC.…”

Section: Interphase Percolationmentioning

confidence: 93%

“…To connect our methodology to real experiments, data previously published from 26 will be evocated. In that work spectroscopy of impedance and dielectric strength were measured for all eight nanocomposites which images were analyzed here in this work.…”

Section: Interphase Percolationmentioning

confidence: 99%

See 2 more Smart Citations

Multifractal Analysis of Particle Dispersion and Interphase Percolation in Nanocomposites

2018

View full text Add to dashboard Cite

The dispersion of nanoparticles in nanocomposites of an epoxy matrix reinforced with alumina (10nm) and zinc oxide (100nm) is analyzed using FIB/FESEM images, varying the volumetric fraction of fillers from 0.2 % to 6.0 %. The nanofillers dispersion images were transformed to binary files and the multifractal spectrum was calculated. From these data the relation between agglomerate and individual particle dimensionalities related to the interphase percolation was investigated. Interphase percolation of nanocomposites should be achieved when the dimensionality of agglomerations is greater than the dimensionality of individual particles. The actual percolation state of the interphase is determined, matching the experimental nanocomposites behavior for electrical behavior at AC and dielectric breakdown at DC.

show abstract

Enhanced mechanical and dielectric properties of Aramid fiber/Mica-nanofibrillated cellulose composite paper with biomimetic multilayered structure

Zhao

Dang

et al. 2018

Cellulose

View full text Add to dashboard Cite

Breakdown, free-volume and dielectric behavior of the nanodielectric coatings based on epoxy/metal oxides

Cited by 17 publications

References 63 publications

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

Magnesium Oxide Nanoparticles: Dielectric Properties, Surface Functionalization and Improvement of Epoxy-Based Composites Insulating Properties

Multifractal Analysis of Particle Dispersion and Interphase Percolation in Nanocomposites

Enhanced mechanical and dielectric properties of Aramid fiber/Mica-nanofibrillated cellulose composite paper with biomimetic multilayered structure

Contact Info

Product

Resources

About