Thermal conductivity of bulk boron nitride nanotube sheets and their epoxy-impregnated composites

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DOIResolve DOI: https://doi.org/10.1002/pssa.201533010
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  1. National Research Council of Canada. Security and Disruptive Technologies
FormatText, Article
Journal titlePhysica Status Solidi A: Applications and Materials Science
ISSN1862-6300
1862-6319
Volume213
Issue8
Pages2237–2242
Abstract
The thermal conductivity of bulk, self-supporting boron nitride nanotube (BNNT) sheets composed of nominally 100% BNNTs oriented randomly in-plane was measured by a steady-state, parallel thermal conductance method. The sheets were either collected directly during synthesis or produced by dispersion and filtration. Differences between the effective thermal conductivities of filtration-produced BNNT buckypaper (∼1.5 W m−1 K−1) and lower-density as-synthesized sheets (∼0.75 W m−1 K−1), which are both porous materials, were primarily due to their density. The measured results indicate similar thermal conductivity, in the range of 7–12 W m−1 K−1, for the BNNT network in these sheets. High BNNT-content composites (∼30 wt.% BNNTs) produced by epoxy impregnation of the porous BNNT network gave 2–3 W m−1 K−1, more than 10× the baseline epoxy. The combination of manufacturability, thermal conductivity, and electrical insulation offers exciting potential for electrically insulating, thermally conductive coatings and packaging. Thermal conductivity of free-standing BNNT buckypaper, buckypaper composites, and related materials at room temperature.
Publication date
PublisherWiley
LanguageEnglish
Peer reviewedYes
NPARC number23000651
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Record identifier01e4ef00-e2d0-4de6-aa56-efc8eba12c43
Record created2016-08-17
Record modified2020-06-04
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