Effect of pre-treatment of nanofillers on the dielectric properties of epoxy nanocomposites

Wang, Qi

doi:10.1109/tdei.2014.004278

Cited by 25 publications

(11 citation statements)

References 24 publications

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“…In the case of ε r ’ (see Figure 7a), increasing the degree of functionalization progressively reduces this parameter until, in the case of NC16, its value is below that of the unfilled epoxy. The effect of filler loading level on the permittivity of nanocomposites has been considered by many workers and, in some cases, it has been reported that the addition of a low volume fraction of a high permittivity nanofiller can result in a reduction in the real relative permittivity [43,44]. While it is commonly proposed that the origin of this effect is related in some way to the existence of nanoparticle/matrix interactions, this assertion has not been fully justified.…”

Section: Resultsmentioning

confidence: 99%

On the Effect of Nanoparticle Surface Chemistry on the Electrical Characteristics of Epoxy-Based Nanocomposites

Yeung

Vaughan

2016

Polymers

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Abstract:The effect of nanosilica surface chemistry on the electrical behavior of epoxy-based nanocomposites is described.The nanosilica was reacted with different volumes of (3-glycidyloxypropyl)trimethoxysilane and the efficacy of the process was demonstrated by infrared spectroscopy and combustion analysis. Nanocomposites containing 2 wt % of nanosilica were prepared and characterized by scanning electron microscopy (SEM), AC ramp electrical breakdown testing, differential scanning calorimetry (DSC) and dielectric spectroscopy. SEM examination indicated that, although the nanoparticle dispersion improved somewhat as the degree of surface functionalization increased, all samples nevertheless contained agglomerates. Despite the non-ideal nature of the samples, major improvements in breakdown strength (from 182˘5 kV¨mm´1 to 268˘12 kV¨mm´1) were observed in systems formulated from optimally treated nanosilicas. DSC studies of the glass transition revealed no evidence for any modified interphase regions between the nanosilica and the matrix, but interfacial effects were evident in the dielectric spectra. In particular, changes in the magnitude of the real part of the permittivity and variations in the interfacial α 1 -relaxation suggest that the observed changes in breakdown performance stem from variations in the polar character of the nanosilica surface, which may affect the local density of trapping states and, thereby, charge transport dynamics.

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Section: Resultsmentioning

confidence: 99%

On the Effect of Nanoparticle Surface Chemistry on the Electrical Characteristics of Epoxy-Based Nanocomposites

Yeung

Vaughan

2016

Polymers

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“…The addition of nano-particles to epoxy resin does however significantly reduce the shape parameter (β), a result which is contrary to several other studies, including Singha et al and Nelson et al [7]. In addition, Wang et al found the surface treatment could modify the reduction of AC breakdown strength and showed a higher value than pure samples in some low filler loading concentrations but still worse in high loadings [8]. He attributes this to the distribution of particles with relatively simple quantitative data.…”

Section: Introductionmentioning

confidence: 82%

Study on quantification method for dispersion and distribution of sphere-like particles and relationship with AC/DC breakdown strength in polymer nanocomposites

Qiang

Wang

Alhabill

et al. 2020

IEEE Trans. Dielect. Electr. Insul.

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Polymer nanocomposites are more and more researched and employed as dielectrics in electrical power equipment. However, the bad dispersion and distribution of particles are often reported to deteriorate the dielectric properties of polymer nanocomposites. In most cases, researchers tend to use SEM/TEM images with imprecise descriptions to describe these two factors, and there was still no clear relationship between their quantified particle dispersion characteristics and dielectric properties of polymer nanocomposites. This work is to, first, propose a combined quantification method to estimate the dispersion and distribution of spherical/ellipsoidal particles/aggregates in polymer nanocomposites based on SEM images of epoxy SiO2 nanocomposites. Based on the proposed quantification method, epoxy nanocomposite with surface treated SiO2 shows overall better dispersion and distribution of particles/aggregates than those with untreated ones. The presence of agglomerations would lead to the enhancement of mobility of charge carriers and thus reduction of breakdown strength, which become more obvious with the growth of filler loadings. It is found that, in AC breakdown tests, dispersion and distribution of particles/aggregates show little influence on the reduction of AC breakdown strength. However, those should be the main factor which influences the DC breakdown strength in epoxy nanocomposites with a variation of filler loading concentrations.

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“…This decrease is attributed to poor dispersion, absence of surface modification and inconsistent processing parameters [54]. The surface modification may help to improve the breakdown strength as shown in Fig.…”

Section: Inconsistencies In Breakdown Strengthmentioning

confidence: 99%

A Review on Nanocomposite Based Electrical Insulations

Paramane¹,

Kumar²

2016

Transactions on Electrical and Electronic Materials

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The potential of nanocomposites have been drawing the intention of the researchers from energy storage to electrical insulation applications. Nanocomposites are known to improve dielectric properties, such as the increase in dielectric breakdown strength, suppressing the partial discharge (PD) as well as space charge, and prolonging the treeing, etc. In this review, different theories have been established to explain the reactions at the interaction zone of polymer matrix and nanofiller; the characterization methods of nanocomposites are also presented. Furthermore, the remarkable findings in the fields of epoxy, cross-linked polyethylene (XLPE), polypropylene and polyvinyl chloride (PVC) nanocomposites are reviewed. In this study, it was observed that there is lack of comparison between results of lab scale specimens and actual field aged cables. Also, non-standardization of the preparation methods and processing parameters lead to changes in the polymer structure and its surface degradation. However, on the positive side, recent attempt of 250 kV XLPE nanocomposite HVDC cables in service may deliver a promising performance in the coming years. Moreover, materials such as self-healing polymer nanocomposites may emerge as substitutes to traditional insulations.

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Effect of pre-treatment of nanofillers on the dielectric properties of epoxy nanocomposites

Cited by 25 publications

References 24 publications

On the Effect of Nanoparticle Surface Chemistry on the Electrical Characteristics of Epoxy-Based Nanocomposites

On the Effect of Nanoparticle Surface Chemistry on the Electrical Characteristics of Epoxy-Based Nanocomposites

Study on quantification method for dispersion and distribution of sphere-like particles and relationship with AC/DC breakdown strength in polymer nanocomposites

A Review on Nanocomposite Based Electrical Insulations

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