Uniaxially Stretched Polyethylene/Boron Nitride Nanocomposite Films with Metal-like Thermal Conductivity

Richao Zhang, zirui Huang, Zihuan Huang, Meiling Zhong, Dongmian Zang, Lu Ai, Xuanfei Lin, Bronagh Millar, Graham Garrett, Gary Menary, Josh Turner, Dehui Ji, Lixian Song, Quanchao Zhang, Jiali Zhang, Dan Sun*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Achieving ultra-high thermal conductivity while maintaining the electrical insulation of polymers is highly desirable for many applications such as thermal management and packaging. In this work, polyethylene/boron nitride nanoplatelets (PE/BNNP) nanocomposite film was produced through melt processing followed by uniaxial stretching. Microstructural analysis reveals that the stretched composite film features a co-continuous network structure which consists of oriented lamellae bridged by both stretched polymer chains and aligned BNNPs along the stretching direction. The resulting film exhibit a metal-like thermal conductivity as high as 106 W m−1 K−1 and it is believed that the unique network structure has enabled efficient phonon transfer across the film, resulting in superior thermal transporting performance. This work shines a light on the design and scalable manufacturing of high performance functional polymer-based composites for future thermal management applications.
Original languageEnglish
JournalComposites Science and Technology
Early online date12 May 2020
DOIs
Publication statusEarly online date - 12 May 2020

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