wang-highlythermocunductive-2020.pdf (2.51 MB)
Highly Thermoconductive, Thermostable, and Super-Flexible Film by Engineering 1D Rigid Rod-Like Aramid Nanofiber/2D Boron Nitride Nanosheets
journal contribution
posted on 2020-02-25, 00:00 authored by K Wu, Jiemin Wang, D Liu, C Lei, Dan LiuDan Liu, Weiwei LeiWeiwei Lei, Q FuPolymer-based thermal management materials have many irreplaceable advantages not found in metals or ceramics, such as easy processing, low density, and excellent flexibility. However, their limited thermal conductivity and unsatisfactory resistance to elevated temperatures (<200 °C) still prevent effective heat dissipation during applications with high-temperature conditions or powerful operation. Therefore, herein highly thermoconductive and thermostable polymer nanocomposite films prepared by engineering 1D aramid nanofiber (ANF) with worm-like microscopic morphologies into rigid rod-like structures with 2D boron nitride nanosheets (BNNS) are reported. With no coils or entanglements, the rigid polymer chain enables a well-packed crystalline structure resulting in a 20-fold (or greater) increase in axial thermal conductivity. Additionally, strong interfacial interactions between the weaved ANF rod and the stacked BNNS facilitate efficient heat flux through the 1D/2D configuration. Hence, unprecedented in-plane thermal conductivities as high as 46.7 W m−1 K−1 can be achieved at only 30 wt% BNNS loading, a value of 137% greater than that of a worm-like ANF/BNNS counterpart. Moreover, the thermally stable nanocomposite films with light weight (28.9 W m−1 K−1/103 (kg m−3)) and high strength (>100 MPa, 450 °C) enable effective thermal management for microelectrodes operating at temperatures beyond 200 °C.
History
Journal
Advanced MaterialsVolume
32Issue
8Article number
1906939Pagination
1 - 9Publisher
WileyLocation
WeinheimPublisher DOI
ISSN
0935-9648eISSN
1521-4095Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2020, WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimUsage metrics
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aramid nanofiberboron nitride nanosheetshigh‐temperature thermal managementrigid chainScience & TechnologyPhysical SciencesTechnologyChemistry, MultidisciplinaryChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterChemistryScience & Technology - Other TopicsMaterials SciencePhysicshigh-temperature thermal managementENHANCED THERMAL-CONDUCTIVITYCOMPOSITE FILMSION BATTERIESMANAGEMENTNANOCOMPOSITEFILLERSHYBRIDBN
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