Driven by the rapid development of modern electronics in minimization, high integration and high-power density, tailored polymer films with high thermal conductivity and electrical insulation have made great progress. However, traditional approaches for enhancing thermal conductivity usually sacrifices processability, electrical insulation and mechanical flexibility of the polymer films.
In a new study published on Composites Science and Technology, a team led by Prof. TIAN Xingyou and ZHANG Xian from Institute of Solid State Physics, Hefei Institutes of Physical Science, the Chinese Academy of Sciences (CAS) developed a laminar PI/rGO@CN composite film with highly thermal conductivity and superior electrical insulation under low filler loading.
In this research, researchers prepared a new kind of thermally conductive composite filler by doping graphene with carbon nitride (rGO@CN). CN can regulate the band gap structure of graphene blocking the transmission of electrons. After adding into PI, rGO@CN were deposited at the bottom of PI matrix under the assistance of gravity during curing and imidization to form laminar structure. The process was similar to the deciduous-like process.
Comparing with the uniform dispersion of filler in matrix, which was unable to form continuous thermal channels under low filler loading, the laminar structure has a unique superiority in constructing compact thermal channels.
The results showed that the thermal conductivity of PI film gets evident enhancement from 0.2 to 6.08 Wm-1K-1 with introduction of rGO@CN.
The heat dissipation capability of PI/rGO@CN composite film was also examined by infrared thermal imaging technology. Results showed that compared to pure PI film, PI/rGO@CN composite film exhibits rapid heat transfer ability.
This work provides referable view for constructing effective thermal management material.
The research was supported by the National Key Research and Development Program of China, Key Project of Science and Technology ServiceNetwork Initiative of the Chinese Academy of Sciences and Anhui Provincial Natural Science Foundation.
Link to the paper: Enhanced thermal conductivity of carbon nitride-doped graphene/polyimide composite film via a “deciduous-like” strategy
Figure 1 (a) Schematic diagram of PI/rGO@CN composite film; (b) thermal conductivity and photographs of PI/rGO@CN composite film.
"deciduous-like" strategy Enhanced thermal conductivity of composite film (Image by WANG Yanyan)
Contact:
ZHAO Weiwei
Hefei Institutes of Physical Science (http://english.hf.cas.cn/)
Email: annyzhao@ipp.ac.cn
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