Abstract
Adding heat conducting particles to a polymer matrix to prepare thermally conductive and electrical insulation materials is an effective approach to address the safety issues arising from the accumulation of heat in the working process of electronic devices. In this work, thermally conductive and electrical insulation nano-paper, consisting of Boron Nitride nano-sheet (BNNS) and cellulose nanofiber (CNF), was prepared using an aerogel 3D skeleton template method. For comparison, BNNS/CNF nano-paper was also produced using a simple blending method. At a BNNS loading of 50 wt%, the thermal conductivity of BNNS/CNF aerogel nano-paper and blended nano-paper at 70 °C are 2.4 W/mK and 1.2 W/mK respectively, revealing an increase of 94.4%. Under similar conditions, the volume resistivity of BNNS/CNF aerogel nano-paper and blended nano-paper are 4.0 × 1014 and 4.2 × 1014 Ω·cm respectively. In view of its excellent thermal conductivity and electrical insulation performance, therefore, BNNS/CNF aerogel nano-paper holds great potential for electronic-related applications.
Highlights
Advancements toward miniaturization and increasing-power in electronic devices, with their resulting continuous accumulation of internal heat, shortens the devices’ lives and causes safety issues such as explosions [1,2,3]
The chemical characteristics of Boron Nitride nano-sheet (BNNS)/cellulose nanofiber (CNF) aerogel nano-paper were observed with an IRPrestige-21 Fourier Transform Infrared Spectrometer (FTIR)
Blended nano-paper had higher volume resistivity than aerogel nano-paper at the same content of BNNS, which might be attributed to more evenly dispersed BNNS in nano-paper prepared over the blending process. Both the BNNS/CNF nano-paper obtained from different methods can fully meet the insulation requirements (Φ > 109 Ω·cm) [39] of the packaging materials under the low voltage and low current working conditions of the electronics
Summary
Advancements toward miniaturization and increasing-power in electronic devices, with their resulting continuous accumulation of internal heat, shortens the devices’ lives and causes safety issues such as explosions [1,2,3]. Conductive composite material with excellent insulation properties can be prepared by adding heat conducting filler particles to the polymer [17,18]. Nitride nano-sheet (BNNS), exfoliated from hexagonal Boron Nitride (h-BN), has a similar crystal structure to graphene [19,20], which is a typical 2D thin sheet material [21,22,23] It is an ideal filler for the preparation of thermal conductive nano-composites due to its high thermal conductivity, resistivity, thermal stability and low thermal expansion rate [24,25]. In this study, using CNF as the substrate, BNNS/CNF composite nano-paper with improved thermally conductivity was prepared using an aerogel 3D skeleton template method. The resulting effects of BNNS content and distribution on the thermal conductivity and electrical insulation properties of BNNS/CNF composite nano-paper were systematically studied
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