Enhanced thermal conductivity and electrically insulating of polymer composites

Highly thermally conductive but electrically insulating polymer composites play an increasingly important role in thermal management applications due to their features of easy processing and lightweight. Herein, a unique segregated network, which consists of graphene nanoplatelets (GNP) and boron ni...

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Veröffentlicht in:Journal of materials science 2021-02, Vol.56 (6), p.4225-4238
Hauptverfasser: Xu, Ziwei, Chen, Yirong, Chen, Xiang, Zhang, Jingjing, Huang, Shijun, Chen, Anfu, Fu, Xiaoling, Wu, Fei, Zhang, Peng
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Sprache:eng
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Zusammenfassung:Highly thermally conductive but electrically insulating polymer composites play an increasingly important role in thermal management applications due to their features of easy processing and lightweight. Herein, a unique segregated network, which consists of graphene nanoplatelets (GNP) and boron nitride fibers (BNF), was constructed in polypropylene (PP)-based composites via two-screw extrusion. The thermal conductivity and electrical insulation characteristic of the composites could be well controlled by adjusting the content and size of GNP and BNF. When PP was filled with 9wt% GNP and 30wt% short BNF, the highest thermal conductivity of 1.32 W/(m·K) was achieved in this work, which is about six times higher than the value of neat PP, while remained a good electrical insulating (as low as 2.98 × 10 −9 S/m). It proposed that the unique segregated network, where the BNF play as a bridge to connect the scattered GNP, could benefit for phonons transmission but effectively interrupt electron conduction. Our work provides a facile method to design and fabricate the highly thermally conductive but electrically insulating composites applied in thermal management materials.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-020-05530-5