Nanostructured polymer films with metal-like thermal conductivity

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.United States. Department of Energy. Office of Energy Efficiency & Renewable Energy/Advanced Manufacturing Program (Award DE-EE0005756)United States. Department of Energy. Office of Science (Contract DE-AC02-06CH11357)United States. Department of Energy. Basic Energy Science (Award DE-FG02-02ER45977