Electrical properties of epoxy/ZnO nano-composite

Wang, Xinyu; Chen, Qingguo; Yang, Hongda; Zhou, Kai; Ning, Xin

doi:10.1007/s10854-018-9394-4

Cited by 17 publications

(16 citation statements)

References 26 publications

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“…For lower frequencies, higher values are observed due to IP. This effect was also observed in other works [ 27 , 54 , 55 ]. In the case of 2.0 wt.% ZnO, the real permittivity is higher than for pure PU for frequencies above 1 Hz.…”

Section: Resultssupporting

confidence: 89%

Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers

et al. 2021

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The influence of different concentrations (0.5, 1.0, and 2.0 wt.%) of Zinc Oxide (ZnO) filler on the dielectric properties of the cold-curing polyurethane (PU) resin is presented in this study. For this purpose, the direct DC conductivity and the broadband dielectric spectroscopy measurements were used to describe the changes in dielectric responses of PU/ZnO nanocomposites over the frequency and temperature range, respectively. It can be stated that, the 1.0 wt.% nanoparticles and lower caused a decrease in the real relative permittivity compared to the pure PU resin, while the higher concentration of nanoparticles for frequencies above 1 Hz had the opposite effect. The presence of nanoparticles in the polyurethane resin affected the segmental dynamics of the polymer chain and changed a charge distribution in the given system. These changes caused a shift of local relaxation peaks in the spectra of imaginary permittivity and dissipation factor of nanocomposites. It is suggested that the temperature-dependent transition of the electric properties in the nano-composite is closely associated with the α-relaxation and intermediate dipolar effects (IDE).

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Section: Resultssupporting

confidence: 89%

Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers

et al. 2021

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“…This increase is caused by IP around NPs, and with temperature it moves to higher frequencies. This effect was also observed in other works [22], [33], [54]. The frequencyindependent area of ε re at 20 o C was in the frequency range of 100 mHz to 10 Hz, then gradually decreased with frequency and from 100 kHz ε re had a value 3.…”

Section: Resultssupporting

confidence: 87%

“…The use of ultrasound provides an efficient, clean, and rapid technological procedure for the synthesis of various PUs. Most of the presented articles [20], [24], [25], [29], [33], [41], [45]- [50] prefer this mechanism with ultrasound for the preparation of NCs from different kinds of NPs in polymers. These processing methods are widely used and preferred because they are not very complicated from a laboratory equipment point of view and allow the available commercially preparation of NCs.…”

Section: Methodsmentioning

confidence: 99%

“…In the last two decades, the dielectric properties (relative permittivityε re and dielectric loss -tan δ) of polymer nano-composites have been evaluated. They values were lower than in pure polymers and microcomposites when insulating oxides were used as fillers [22], [23], [24], [25], [26]. Many studies have clearly shown that adding some volume of nanoparticles (NPs) to ERs improves several characteristics, such as the dimensional stability, dielectric properties, energy dissipation capabilities, and the high-performance stiffness of polymer composites.…”

Section: Introductionmentioning

confidence: 99%

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Study of the Complex Permittivity of a Polyurethane Matrix Modified by Nanoparticles

et al. 2021

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This study presents the influence of various types of nanoparticle (NP) fillers incorporated into a polyurethane (PU) (VUKOL 022) matrix and its subsequent changes in complex permittivity. Two types of surface modification of SiO 2 fillers were investigated. The frequency dependence of the real and imaginary parts of complex permittivity was measured within the frequency range of 1 mHz to 1 MHz using the capacitance method. The 1 wt.% NPs in PU caused an increase (MgO, TiO 2 , n-SiO 2 , and f-SiO 2 ) or a decrease (d-SiO 2 ) in the real permittivity. The α-relaxation and intermediate dipolar effect were observed at the temperature dependence of the imaginary permittivity. The change in permittivity by various surface modifications of SiO 2 and other nanofillers was discussed based on the multi-core model. Moreover, the NPs caused a shift in the local maximum of the permittivity, which was a result of the interfacial polarisation and a charge multiplication of the α-relaxation process.

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“…It is reasonable to believe that they have potential to be developed into new materials with special properties [8][9][10]. In the research of EP composites, there are many studies on their dielectric properties, and the commonly used nanoparticles are SiC [11], SiO 2 [12,13], ZnO [14], Al 2 O 3 [15], TiO 2 [16,17]. The addition of nanoparticles improves the thermal stability, mechanical properties and electrical properties of EP composites for varying degrees.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties and corona resistance of Si-B/epoxy nano-composites

Zhao

2019

J Mater Sci: Mater Electron

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In order to meet the increasing requirements for materials in the electrical and electronic industry, in this paper, Si-B oxides were designed and synthesized via the organic monomers of Si and B, and the Si-B/epoxy nanocomposites were prepared by ultrasonic dispersion and thermal curing. The Si-B oxides were dispersed uniformly in epoxy resin with great compatibility and the average size of the particles was about 6 nm. Results showed that with the increase of doping content, the dielectric constant and dielectric loss of the Si-B/epoxy nanocomposites decreased, but the effect on the conductivity was not obvious. The dielectric strength and corona resistance life of the Si-B/epoxy nanocomposites increased at first and then decreased. When the doping content was 6 wt%, the corona resistance life of the Si-B/epoxy nanocomposites reached up to 17.6 h, which was 8.38 times of that of pure EP. It was proved that the dielectric properties and corona resistance of epoxy could be effectively improved by doping the Si-B oxides.

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Electrical properties of epoxy/ZnO nano-composite

Cited by 17 publications

References 26 publications

Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers

Dielectric Responses of Polyurethane/Zinc Oxide Blends for Dry-Type Cast Cold-Curing Resin Transformers

Study of the Complex Permittivity of a Polyurethane Matrix Modified by Nanoparticles

Dielectric properties and corona resistance of Si-B/epoxy nano-composites

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