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Study on Pore Structure Regulation of h-BN/TOCNF Aerogel and Thermal Conductivity of Its Composite Film |
Received:September 09, 2021 |
DOI:10.11980/j.issn.0254-508X.2021.11.005 |
Key Words:h-BN TOCNF aerogel composite film electrical insulation property thermal conductivity |
Fund Project:“十三五”国家重点研发计划课题(2017YFD0601005)。 |
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Abstract:To solve the heat-dissipation issue of miniaturized electronic and electrical equipment, the hexagonal boron nitride (h-BN)/TEMPO-oxidization nanocellulose (TOCNF) aerogels with different pore structure were designed and prepared in this study, which was then compounded with TOCNF to fabricate h-BN/TOCNF composite films. The results showed that when the ratio of h-BN to TOCNF was 3 ∶ 1, h-BN could form a 3D thermal conductive pathway along the TOCNF framework inside the h-BN/TOCNF aerogelin which TOCNF generated the minimum thermal resistance between h-BNs and played a favorable role in dispersing h-BNs, showing the maximum structuring efficiency of the 3D thermal conductive pathway. The thermal conductivity of the h-BN/TOCNF composite film was as high as 1.355 W/(m·K), 228% higher than that of the pure TOCNF film, the volume resistivity was 4.53×1014 Ω•cm, indicating good electrical insulation property. In addition, thermogravimetric (TG) analysis showed that the initial decomposition temperature of h-BN/TOCNF composite film was about 210°C, showing good thermal stability. Furthermore, desirable mechanical properties of h-BN/TOCNF composite film were endowed, the elongation at break and tensile strength of h-BN/TOCNF1 were 13% and 24.8 MPa when the ratio of h-BN to TOCNF was 1 ∶ 1, respectively. It was worth noting that with the increase of h-BN loading, the elongation at break of the composite films decreased, while the tensile strength had negligible variation. |
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