Rotational stress-induced shish-kebab governs the balance of enhanced thermal conductivity and mechanical performance of high-density polyethylene (HDPE) / boron nitride (BN) composites via axial hot compression

Polymer-based composites with high BN sheets loadings have potential to improve thermal conductivity without compromising mechanical performance. In this work, a balanced enhancement in both thermal conductivity and tensile strength were achieved using rotational shear followed by axial hot compression. For neat HDPE matrix, the highly oriented shish-kebab structures induced by shear field improved tensile strength from 20.4 MPa to 80.9 MPa, compared with unsheared specimens. The in-plane thermal conductivity of sheared HDPE/BN composite was 25.0% higher than the unsheared one. Axial hot compression resulted in denser crystal and oriented fillers, leading to a 63% increase in tensile strength while simultaneously increasing thermal conductivity in both in-plane and out-plane directions. This work has utilized rotation shear and axial hot compression to manufacture HDPE/BN composites with effective two-way thermal conductivity and higher tensile strength. The excellent thermo-mechanical properties mean a longer service time and less replaced frequency of material under extreme operating conditions. The two-step methods provide a key information for the preparation of composites with balanced mechanical properties and thermal conductivity.

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Work Title Rotational stress-induced shish-kebab governs the balance of enhanced thermal conductivity and mechanical performance of high-density polyethylene (HDPE) / boron nitride (BN) composites via axial hot compression
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Open Access
Creators
  1. Bin Chen
  2. Jiawei Gong
  3. Jie Zhang
  4. Cong Deng
  5. Xueqin Gao
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Materials Today Communications
Publication Date March 1, 2024
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.mtcomm.2023.107911
Deposited November 18, 2024

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  • Created
  • Added 1-s2.0-S2352492823026028-main.pdf
  • Added Creator Bin Chen
  • Added Creator Jiawei Gong
  • Added Creator Jie Zhang
  • Added Creator Cong Deng
  • Added Creator Xueqin Gao
  • Published
  • Updated