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With the continuous advancement of semiconductor manufacturing technology and the continuous development of the electronics industry, the heat dissipation problem of electronic devices is increasingly drawing attention. More and more thermal conductive materials are being used in portable devices, electronic devices, and energy fields. Polymers are often used in the manufacture of electronic equipment and integrated circuit packaging materials, but the thermal conductivity of polymer itself is not high, generally less than 0.5 W/m·K, can not meet the application needs of high-power electronic equipment. In response to this shortcoming, graphene with high intrinsic thermal conductivity has been widely used as a nano-filler to blend with a polymer to form a composite material to increase the overall thermal conductivity. However, the composite materials prepared by the blending method have very limited effect on improving the thermal conductivity. Therefore, constructing a three-dimensional graphene structure with a continuous network of heat conduction in the polymer substrate is an effective means to solve this problem.
The functional carbon materials team of the Surface Business Department of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences has developed a method for preparing graphene/high-molecular high-thermal-conductivity composite materials with low cost, simple process, and large-scale application. The surface of the body is evenly coated with graphene nanosheets, and then a composite material is prepared by hot pressing. Through this process, graphene can form a cell-like three-dimensional structure in a polymer substrate, and the thermal conductivity of the composite material can reach twice that of a general melt-mixing method. This method is applicable to all types of thermoplastic polymers, including polyethylene, polyvinyl alcohol, polyvinylidene fluoride, etc. The intrinsic thermal conductivity of a high molecular polymer can be achieved at a weight percentage of graphene of 10%. Increase 5–6 times. This work helps to promote the development of the preparation and application of graphene-related polymer thermal conductive composites.
At present, related work has been accepted by Journal of Materials Chemistry A (DOI: 10.1039/c7ta00750g). The research was funded by the National "Years of Thousand Talents Program" and the "100 People Program" of the Chinese Academy of Sciences, the National Natural Science Foundation of China (51573201), the Zhejiang Provincial Philanthropy Technology Applied Research Project (2016C31026), and the 3315 Innovation Team Project.
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