Dielectric and thermal properties of epoxy/boron nitride nanotube composites

Abstract

We report the fabrication of and investigations into the dielectric and thermal properties of epoxy/boron nitride nanotube (BNNT) composites. It was found that BNNT fillers can effectively adjust the dielectric constant of epoxy. Moreover, the thermal conductivity of epoxy was improved by up to 69 % with 5 wt % BNNTs. Our studies indicate that BNNTs are promising nanofillers for polymers, to obtain and control an adjustable dielectric property and improved thermal conductivity.

Electrically insulating polymeric nanocomposites with enhanced thermal conductivity by visible-light curing of epoxy-boron nitride nanotube formulations

“…Only a slight increase can be seen for composites after adding BNNTs, especially for that with 1.5 wt%, probably due to the generation of interfaces that led to interfacial losses. The increase of loss with frequency has been related by other authors to the presence of pores in samples . We can conclude that the composites remained as dielectric after adding BNNTs but with reduced dielectric constant, which can be adjusted with filler amount.…”

Large-surface-area BN nanosheets and their utilization in polymeric composites with improved thermal and dielectric properties

“…A maximum reinforcement for PMMA with 23 wt.% BN is 2.5 times of blank PMMA at 10 6 Hz. The measured dielectric constants were higher than the theoretically calculated mixing average values based on logarithmic mixing rule or Maxwell-Garnett approximation [30]. These exceptionally high dielectric constants should mainly result from special interfaces.…”

Microwave Dielectric Properties of Oriented BN / Polyvinyl Butyral Matrix Composites

“…The density of the specimens was measured using a gas pycnometer (GP, Model AccuPyc1330, Micromeritics, USA), and the theoretical density (ρ t ) was calculated using Eq. (1), (1) where ρ t , ρ m , ρ f , and V f are the densities of the composites, the matrix, and the filler, and the volume fraction of the filler, respectively. 8) The dependence of the frequencies on the dielectric properties was measured using the openended coaxial resonator probes method 9) in a frequency range of 1 GHz to 9.4 GHz.…”

“…In order to facilitate high-frequency applications and resonant frequency selectivity in microwave devices, these composites must have proper dielectric properties, such as a low dielectric constant (K), which reduces the signal propagation delay, as well as a low dielectric loss (tan δ), which improves the performance of devices. 1) Recently, various ceramics-filled polymer composites have been investigated due to the high dielectric performance of ceramics and the low cost and facile processing of polymers. The dielectric properties of ceramics/polymer composites are highly dependent on the content of the ceramics and the orientation of the plate-shaped ceramics, resulting in a wide range of electrical properties and thus allowing the materials to be tailored for a variety of uses.…”