Abstract
In this study, epoxy-cubic boron nitride composites are fabricated, and their dielectric response is investigated. They exhibit the same trend as epoxy composites reinforced with other filler types. Thus, at low filler concentrations, they exhibit a lower relative permittivity than neat epoxy. As the fill grade further increases, the relative permittivity of the composites increases as well. It is suggested that two competing mechanisms, namely polymer re-organization and water uptake, mainly determine the dielectric response of epoxy composites. The former is related to the decrease while the latter to the increase of the relative permittivity. The experimental results clearly verify that water uptake strongly depends on the filler concentration and not only affects the dielectric response of epoxy composites but also it is one of the main mechanisms which dictate their dielectric behavior.
Highlights
The dielectric response of epoxy nanocomposites is undoubtedly one of the properties which give us convincing evidence that the introduction of fillers affects the structureComposites most of the time exhibit the lowest relative permittivity at low fill grades [1, 12,13,14,15]
The dielectric response of epoxy-cubic boron nitride (E-cBN) composites was evaluated, and it was found that they show a similar behavior with other epoxy nanocomposites, namely epoxyaluminum nitride, epoxy-magnesium oxide, epoxy-aluminum oxide, and epoxy-hexagonal boron nitride
It has been experimentally shown that water uptake significantly affects the dielectric response of neat epoxy and epoxy composites
Summary
The dielectric response of epoxy nanocomposites is undoubtedly one of the properties which give us convincing evidence that the introduction of fillers affects the structureComposites most of the time exhibit the lowest relative permittivity at low fill grades [1, 12,13,14,15]. There is a critical filler concentration above which the relative permittivity increases with the filler content It was suggested in a previous study that the increase in relative permittivity is related to water uptake [16]. The dielectric response of epoxy-cubic boron nitride (E-cBN) composites is presented. These composites show the same trend (minimum value of relative permittivity at a low fill grade) as other epoxy composites, and there is a significant influence of water uptake. It is demonstrated that the impact of water uptake depends on the fill grade This is depicted in the dielectric response and in the thermogravimetric analyses (TGA) carried out on the composites. The dielectric response of the composites with cBN particles is compared
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