March 28 learned from the Chinese Academy of Sciences, with the continuous improvement of semiconductor manufacturing technology and the continuous development of the electronics industry, the issue of heat dissipation of electronic devices is increasingly concerned about more and more thermal conductivity materials are used in portable devices, electronic equipment and energy field. Macromolecular polymers are often used in electronic equipment manufacturing and integrated circuit packaging materials, but the polymer itself is not high thermal conductivity, generally less than 0.5 W / m · K, can not meet the high-power electronic equipment applications. In response to this shortcoming, graphene with high intrinsic thermal conductivity has been widely used as a nano-filler and polymer blends to form a composite material to improve the overall thermal conductivity. However, the composite prepared by the blending method has only a limited effect on improving the thermal conductivity. Therefore, building a three-dimensional graphene structure with a continuous network of thermal conduction in the polymer matrix is ​​an effective solution to this problem.
Surface Materials Division, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Functional carbon materials team developed a low-cost, simple process, and large-scale application of graphene / polymer high thermal conductivity of composite materials, polymer powder The surface of the graphene is evenly coated with the nanosheet, and the composite material is prepared by hot pressing. Through this process, graphene can form a three-dimensional cellular structure in the polymer matrix, the composite material thermal conductivity can reach twice the general melt mixing products. This method is suitable for a variety of thermoplastic polymers, including polyethylene, polyvinyl alcohol, polyvinylidene fluoride, etc., in the amount of 10% by weight of graphene added, the polymer can be intrinsic thermal conductivity Increase by 5 6 times. This work will help promote the development and application of graphene-related polymer thermal conductive composites.
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