Improved thermal, structural and electrical properties of epoxy for use at high voltages

Lee, K.Y.; Lee, K.W.; Choi, Yong-Sung; Park, D.H.; Lim, Kee-Joe

doi:10.1109/tdei.2005.1453461

Cited by 20 publications

(3 citation statements)

References 5 publications

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“…Epoxy resin is a class of thermosetting polymers that are commonly used in electronics and power systems, i.e., as packaging materials for electronic encapsulation, as structural and insulating materials for high-voltage dry-type bushing and high-voltage transformer, and as coating layers for high-voltage gas insulated switchgear [1][2][3][4]. With the miniaturization of advanced electronics and the continuous increase of power capacity and transmission voltage level, the epoxy-based insulating materials with high performance such as enhanced toughness, adhesion strength, dielectric strength and water resistance, for electronic devices and electrical equipment are urgently needed [2,4].…”

Section: Introductionmentioning

confidence: 99%

Synergetic enhancement of mechanical and electrical strength in epoxy/silica nanocomposites via chemically-bonded interface

Liu

Tian

et al. 2018

Composites Science and Technology

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While the incorporation of the inorganic fillers into polymers is envisioned to improve the properties of polymers, the organic-inorganic interface in the nanocomposite plays a prominent role in the modulation of the electrical, mechanical and thermal properties. Here, the epoxy chain-grafted silica nanoparticles were prepared and utilized as the fillers in epoxy matrix. The multiple physical properties such as the tensile strength, the elongation at break, the glass transition temperature, the dielectric strength of the nanocomposites with epoxy chain-grafted silica are simultaneously improved in comparison with those of the neat epoxy and the nanocomposites with unmodified silica. Moreover, substantial reductions in the water absorption ratio, dielectric loss and electric conductivity are obtained in the nanocomposites filled with epoxy-grafted silica even at relatively low filler loadings. These results verify the critical role of the chemically-bonded interface between organic and inorganic phases in determining the mechanical and dielectric strength of the polymer nanocomposites. The interaction zone models for the interface between nanoparticle and polymer matrix have been proposed to rationalize the experimental results.

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Section: Introductionmentioning

confidence: 99%

Synergetic enhancement of mechanical and electrical strength in epoxy/silica nanocomposites via chemically-bonded interface

Liu

Tian

et al. 2018

Composites Science and Technology

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“…The volume of power equipment enlarges with the rising voltage level. At the same time, the requirements for mechanical, thermal, and insulation performances become higher [ 1 , 2 ]. Therefore, insulating materials with synergistically improved multi-performance have become a hotspot [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Synergistical Performance Modification of Epoxy Resin by Nanofillers and Carboxyl-Terminated Liquid Nitrile–Butadiene Rubber

Liu

Yao

et al. 2021

Materials

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Epoxy composite materials are widely used in power equipment. As the voltage level increases, the requirement of material properties, including electrical, thermal, and mechanical, has also increased. Introducing thermally conductive nanofiller to the epoxy/liquid rubber composites system is an effective approach to improve heat performance, but the effects of thermally conductive nanofillers on relaxation characteristics remain unclarified. In this paper, nano-alumina (nano-Al2O3) and nano-boron nitride (nano-BN) have been employed to modify the epoxy/carboxyl-terminated liquid nitrile–butadiene rubber (epoxy/CTBN) composites system. The thermal conductivity and glass transition temperature of different formula systems have been measured. The effect of the nanofillers on the relaxation behaviors of the resin matrix has been investigated. Results show that the different kinds of nanofillers will introduce different relaxation processes into the matrix and increase the conductivity at the same time. This study can provide a theoretical basis for the synergistic improvement of multiple properties of epoxy resin composites.

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“…In spite of continuous increasing attention, the mechanisms of charge generation, its storage and transportation within the organic insulating polymer, and the effect of their structure on these processes is still not fully understood. The application of insulating polymers in electrical industry has increased remarkably over the few years and the information on stabilization of hetero or homo charge is of interest for several industrial applications [1][2][3]. The Thermally Stimulated Current (TSC) technique is ideal for the investigation of the structure of polymers, semi-crystalline polymers and co-polymers because it is a more sensitive alternative than other thermal analysis techniques for detecting the transitions that depend on changes in mobility of molecular scale structural units [4].…”

Section: Introductionmentioning

confidence: 99%

Novel Polymer Nanocomposites for Microelectronics Applications

Mishra

2020

Int. J. Eng. Tech. Mgmt. Res.

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The effect of polarization time on the space charge relaxation behavior of pure and nano ZnO doped PVK samples has been studied. The study has been carried out by thermally stimulated depolarization current patterns of electrets formed by polarization method at 350 volts field strengths at 40◦C to 70◦C with constant heating rates. The results obtained show the shift of the TSD peak position towards lower temperature ranges. Decrease in activation energy was observed corresponding to the increase in polarizing field. The intensity of the peak maxima results in being a good indicator of the trapped carrier number evolution. For high temperatures and high electrical fields the saturation of the phenomenon is achieved faster, which is attributed to facilitated carrier mobility.

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Improved thermal, structural and electrical properties of epoxy for use at high voltages

Cited by 20 publications

References 5 publications

Synergetic enhancement of mechanical and electrical strength in epoxy/silica nanocomposites via chemically-bonded interface

Synergetic enhancement of mechanical and electrical strength in epoxy/silica nanocomposites via chemically-bonded interface

Synergistical Performance Modification of Epoxy Resin by Nanofillers and Carboxyl-Terminated Liquid Nitrile–Butadiene Rubber

Novel Polymer Nanocomposites for Microelectronics Applications

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