화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.82, 173-179, February, 2020
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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Thiswork offers a simple fabrication ofporousboron-nitride-(BN)/polyimide-(PI) composite films withhigh 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 mm2/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.
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