Nanostructured polymer films with metal-like thermal conductivity

• Published in: Nature communications Vol. 10; no. 1; pp. 1771 - 8
• Main Authors: Xu, Yanfei, Kraemer, Daniel, Song, Bai, Jiang, Zhang, Zhou, Jiawei, Loomis, James, Wang, Jianjian, Li, Mingda, Ghasemi, Hadi, Huang, Xiaopeng, Li, Xiaobo, Chen, Gang
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 16-04-2019; Nature Publishing Group; Nature Portfolio
• Subjects: 147/135; 639/166/988; 639/301/923/1028; Chemical synthesis; Conductors; Heat conductivity; Heat transfer; Humanities and Social Sciences; Insulators; MATERIALS SCIENCE; Mathematical models; Metals; multidisciplinary; Nanofibers; Organic chemistry; Polyethylene; Polyethylene films; Polymer films; Polymers; Product design; Science; Science (multidisciplinary); Thermal analysis; Thermal conductivity; Thermal conductors; Thermal management
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-019-09697-7

Due to their unique properties, polymers – typically thermal insulators – can open up opportunities for advanced thermal management when they are transformed into thermal conductors. Recent studies have shown polymers can achieve high thermal conductivity, but the transport mechanisms have yet to be elucidated. Here we report polyethylene films with a high thermal conductivity of 62 Wm
−1
K
−1
, over two orders-of-magnitude greater than that of typical polymers (~0.1 Wm
−1
K
−1
) and exceeding that of many metals and ceramics. Structural studies and thermal modeling reveal that the film consists of nanofibers with crystalline and amorphous regions, and the amorphous region has a remarkably high thermal conductivity, over ~16 Wm
−1
K
−1
. This work lays the foundation for rational design and synthesis of thermally conductive polymers for thermal management, particularly when flexible, lightweight, chemically inert, and electrically insulating thermal conductors are required.
Thermally conductive polymers can be used for advanced thermal management applications but the transport mechanisms have yet to be elucidated. Here the authors report the synthesis of polyethylene films with high thermal conductivity, which is attributed to the amorphous regions of the nanofibers.