Impact of the Processing-Induced Orientation of Hexagonal Boron Nitride and Graphite on the Thermal Conductivity of Polyethylene Composites
Author | Ali, Mehamed |
Author | Sobolciak, Patrik |
Author | Krupa, Igor |
Author | Abdala, Ahmed |
Available date | 2024-05-01T06:32:51Z |
Publication Date | 2023 |
Publication Name | Polymers |
Resource | Scopus |
Identifier | http://dx.doi.org/10.3390/polym15163426 |
ISSN | 20734360 |
Abstract | Emergent heat transfer and thermal management applications require polymer composites with enhanced thermal conductivity (κ). Composites filled with non-spherical fillers, such as hexagonal boron nitride (hBN) and Graphite (Gr), suffer from processing-induced filler orientations, resulting in anisotropic κ, commonly low in the through-plane direction. Here, the effects of extrusion and compression molding-induced orientations on κ of hBN- and Gr-filled polyethylene composites were investigated. The effect of extrusion on the hBN orientation was studied using dies of various shapes. The shaped extrudates exhibited hBN orientations parallel to the extrusion flow direction, which prompted additional hBN orientation during compression molding. κ of the composites produced with shaped extrudates varied from 0.95 to 1.67 W m−1 K−1. Pelletizing and crushing the extrudates improved κ, by exploiting and eliminating the effect of extrusion-induced hBN orientations. Gr-filled composites showed better κ than hBN composites due to the higher intrinsic conductivity and bigger particle sizes. A maximum κ of 5.1 and 11.8 W m−1 K−1 was achieved in composites with oriented hBN and Gr through a thin rectangular die and stacking the sheets to fabricate composites with highly oriented fillers. |
Sponsor | This publication was made possible by an NPRP award [NPRP # 10-0205-170349] from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors. |
Language | en |
Publisher | MDPI |
Subject | filler alignment graphite hBN polyethylene composites thermal conductivity |
Type | Article |
Issue Number | 16 |
Volume Number | 15 |
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