Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 23, Pages 13000-13006Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03007
Keywords
thermal conductivity; polymer-based composites; hexagonal boron nitride; orientation; magnetic alignment
Funding
- National Science Foundation of China [51376070]
- 973 Project of The Ministry of Science and Technology of China [2011CB013105]
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Hexagonal boron nitride (hBN) platelets are widely used as the reinforcing fillers for enhancing the thermal conductivity of polymer-based composites. Since hBN platelets have high aspect ratio and show a highly anisotropic thermal property, the thermal conductivity of the hBNs-filled composites should be strongly associated with the platelets' orientation. However, the orientation effect has been explored loss frequently due to the technical difficulties in precontrol of the platelets' orientation in the polymer matrix. In this paper, we report the use of magnetic fields to assemble the platelets into various microstructures and to study the thermal conductivities of the designed composites. The experimental results showed that thermal conductivities are dramatically different among these composites. For instance, the thermal conductivities of the composites with platelets oriented parallel and perpendicular to the heat flux direction are respectively 44.5% higher and 37.9% lower than that of unaligned composites at the volume fraction of 9.14%. The results were also analyzed by a theoretical model. The model suggests that the orientation of the hBN platelets is the main reason for the variance in the thermal conductivity.
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