Improved thermal conductivity of thermoplastic polyurethane via aligned boron nitride platelets assisted by 3D printing

By Junchao Liu, Weiwei Li, Yufeng Guo, Hui Zhang, Zhong Zhang. Composites. Part A, Applied science and manufacturing, 2019

170 citations recorded by the source corpus.

Abstract Thermal management is of importance to microelectronics. Owning both excellent thermal conduction and electrical insulation, hexagonal boron nitride (hBN) platelets are widely used in polymer matrices. While the thermal properties rely on the orientation of hBN platelets in polymer matrices significantly. Herein, we report that high thermal conductive hBN filled thermoplastic polyurethane (TPU) composites can be achieved by a fused deposition modeling 3D printing technique. The hBN platelets show excellent alignment along printing direction in TPU matrix due to the shear-inducing effect of printing. The sample along printing direction at filler loading of 25.9 vol% (40 wt%) exhibits the thermal conductivity up to 2.56 Wm−1 K−1 at 100 °C along printing direction, i.e. 10- and 2.8-time enhancement, compared to those of neat TPU and hBN/TPU sample tested along thickness direction. The surface temperature distribution of samples with various heating durations is also presented. The effects of some key parameters, i.e. nozzle diameter, printing speed as well as filler loading, on the alignment level of hBN are also investigated. Finally, the alignment level of the platelets is predicted by effective medium approximation, which is consistent with that measured by small angle X-ray scattering.

Subfields: Automotive Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/ee31fdca620c29ef85e4e64f98d6d93b54625675

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

  1. Xuezhong Zhang
  2. Wanqiu Zhu
  3. Dong Xiang
  4. E. Harkin-jones
  5. Ping Wang
  6. Chunxia Zhao
  7. Yucai Shen
  8. Zuoxin Zhou

Citations in the corpus