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Researchers introduce an energy-efficient method to enhance thermal conductivity of polymer composites

The proposed method can improve thermal management in electronics and batteries

Date:
November 30, 2022
Source:
Pusan National University
Summary:
Thermally conductive polymer composites consist of fillers oriented in certain directions that form pathways for heat flow. However, conventional methods to control the orientation of these fillers are energy-intensive and require surface modifications that can deteriorate the quality and properties of these materials. Now, researchers have developed an energy-efficient method to control the orientation of the fillers without the need for surface modification, resulting in improvement in thermal conductivity.
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Owing to their lightweight nature and flexibility, thermally conductive polymer composites are applied between a heat source and a sink in electronics to dissipate the generated heat to the surroundings. Efficient heat dissipation is achieved due to the use of fillers with certain orientations that facilitate heat flow. The conventional process of modifying the orientation of the filler material, however, is an energy-intensive process that requires the use of electric/magnetic fields and surface modifications that can compromise the filler's quality and its thermal properties.

Now, in a new study, Professor Chae Bin Kim and his team at Pusan National University, Republic of Korea, have developed an energy-efficient process to change the orientation of the filler without the need for surface modifications.

This paper was made available online on 17 October 2022 and will be published in Volume 117 of the journal Polymer Testing on 1 January 2023.

The proposed method makes use of thermophoresis, a phenomenon in which a temperature gradient causes solid particles suspended in a fluid medium to move or rotate. To prepare the polymer composite, the researchers suspended thermally conductive hexagonal boron nitride (h-BN) filler particles in a UV-curable liquid and coated it between two glass plates. A temperature gradient was applied along the film thickness, causing the filler particles to rotate, and realign along the applied temperature gradient. On achieving the desired orientations, the composite was photocured, resulting in a solid composite with fixed filler orientations that form a heat transfer pathway.

"To our best knowledge, the current study is the first experimental demonstration of controlling anisotropic filler orientation using thermophoresis," says Professor Kim.

Thermally conductive polymer composites such as thermal paste are used in phones, laptops, even in batteries. Considering the growing production of electronics and the expected transition to electric vehicles, the proposed method has the potential to lower the energy cost of manufacturing thermally conductive polymer composites. Furthermore, by avoiding the need for surface modifications, highly efficient thermally conductive polymer composites can be developed for improved heat dissipation and extend the life of electronics.

"Efficient heat dissipating materials can ensure best operating conditions for the device with improved reliability, lifespan, and user's safety," says Professor Kim.

Apart from improving thermal conductivity, fillers are also used to alter a composite's optical, electrical, and mechanical properties. By offering a way to reorient the filler without any surface modifications, the proposed method can also be adopted to tune the properties of a wide range of polymer composites without deteriorating their quality.


Story Source:

Materials provided by Pusan National University. Note: Content may be edited for style and length.


Journal Reference:

  1. Seong-Bae Min, Mingeun Kim, Kyu Hyun, Cheol-Woo Ahn, Chae Bin Kim. Thermally conductive 2D filler orientation control in polymer using thermophoresis. Polymer Testing, 2023; 117: 107838 DOI: 10.1016/j.polymertesting.2022.107838

Cite This Page:

Pusan National University. "Researchers introduce an energy-efficient method to enhance thermal conductivity of polymer composites." ScienceDaily. ScienceDaily, 30 November 2022. <www.sciencedaily.com/releases/2022/11/221130114038.htm>.
Pusan National University. (2022, November 30). Researchers introduce an energy-efficient method to enhance thermal conductivity of polymer composites. ScienceDaily. Retrieved April 23, 2024 from www.sciencedaily.com/releases/2022/11/221130114038.htm
Pusan National University. "Researchers introduce an energy-efficient method to enhance thermal conductivity of polymer composites." ScienceDaily. www.sciencedaily.com/releases/2022/11/221130114038.htm (accessed April 23, 2024).

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