Porous boron nitride/polyimide composite films with high thermal diffusivity and low dielectric properties via high internal phase Pickering emulsion method

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This work offers a simple fabrication of porous boron-nitride-(BN)/polyimide-(PI) composite films with high thermal diffusivities and low dielectric constants by combining high-internal-phase Pickering emulsification (HIPPE) and subsequent hot-pressing. BN nanoparticles in composite foams were well dispersed and three-dimensionally connected following the surface of the PI skeleton used as the polymer matrix. The BN contents in the BN/PI composite foams were adjusted in the range of 20-80 wt%. The porosities of the composite films were controlled according to the hot-pressing conditions such as the temperature. The porous BN/PI composite films exhibited high thermal diffusivities of 0.059-1.033 mm(2)/s and low dielectric constants of 2.08-3.48 at 1 GHz for BN contents of 20-80 wt%. In particular, the BN/PI composite films had extremely low dielectric loss values, close to zero (<0.002) at high frequencies regardless of the BN content and pressing conditions. (C) 2019 The Korean Society of Industrial and Engineering Chemistry.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2020-02
Language
English
Article Type
Article
Citation

JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, v.82, pp.173 - 179

ISSN
1226-086X
DOI
10.1016/j.jiec.2019.10.010
URI
http://hdl.handle.net/10203/272392
Appears in Collection
CBE-Journal Papers(저널논문)
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