Abstract
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.
Highlights
The volume of power equipment enlarges with the rising voltage level
There has been a lot of research on the epoxy/rubber composites system (ERs) including covering morphology, kinetics, electricity, thermodynamic, and mechanics [8,9,10], as well as relaxation behavior of dielectric [11,12,13]
The relaxation polarization processes are obtained through peak splitting. By comparing these properties of epoxy resin modified by CTBN and nanofillers, the effect and mechanism of two kinds of thermally conductive nanofillers on cross-linking degree, relative permittivity, and dielectric loss of epoxy/CTBN composites system are analyzed
Summary
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]. There has been a lot of research on the epoxy/rubber composites system (ERs) including covering morphology, kinetics, electricity, thermodynamic, and mechanics [8,9,10], as well as relaxation behavior of dielectric [11,12,13]. Better properties of thermal conductivity and breakdown strength were achieved in epoxy composites enhancing by micro-BN and nano-Al2 O3 together. Through dual modification by liquid rubber and thermally conductive fillers, a joint improvement of the crack resistance and thermal properties of epoxy resin has been achieved in previous research. The relaxation polarization processes are obtained through peak splitting By comparing these properties of epoxy resin modified by CTBN and nanofillers, the effect and mechanism of two kinds of thermally conductive nanofillers on cross-linking degree, relative permittivity, and dielectric loss of epoxy/CTBN composites system are analyzed. The research results can provide a theoretical basis for the synergistic improvement of multiple properties of epoxy resin
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