Jmca: new progress in graphene / polymer thermal conductive composites

With the continuous progress of semiconductor manufacturing technology and the development of electronic industry, more and more attention has been paid to the heat dissipation of electronic equipment More and more heat conducting materials have been applied to the field of portable devices, electronic equipment and energy Polymer is often used in electronic equipment manufacturing and integrated circuit packaging materials, but the thermal conductivity of polymer itself is not high, generally lower than 0.5 w / m · K, which can not meet the application requirements of high-power electronic equipment In order to improve the overall thermal conductivity, graphene with high intrinsic thermal conductivity has been widely used as nano filler and polymer blend to form composite materials However, the improvement of thermal conductivity of the composite prepared by blending is very limited Therefore, the construction of three-dimensional graphene structure with continuous heat conduction network in polymer substrate is an effective way to solve this problem The functional carbon materials team of Ningbo Materials Institute of Chinese Academy of Sciences has developed a preparation method of graphene / polymer high thermal conductivity composite material with low cost, simple process and large-scale application The surface of polymer powder is uniformly coated with graphene nano sheet, and then the composite material is prepared by superheating and pressing Through this process, graphene can form a cell like three-dimensional structure in the polymer substrate, and the thermal conductivity of the composite can be twice as high as that of the products produced by the general melt mixing method This method can be applied to all kinds of thermoplastic polymers, including polyethylene, polyvinyl alcohol, polyvinylidene fluoride, etc the intrinsic thermal conductivity of polymer can be increased by 5-6 times when the weight percentage of graphene is 10% This work is helpful to promote the preparation and application of graphene related polymer thermal conductive composites At present, the related work has been accepted by Journal of Materials Chemistry A (DOI: 10.1039 / c7ta00750g) The research work was supported by the national "youth thousand talents plan" and the "hundred talents plan" of the Chinese Academy of Sciences, the National Natural Science Foundation (51573201), the Zhejiang public welfare Technology Application Research Plan (2016c31026) and the 3315 innovation team project Graphene / thermoplastic polymer thermal conductive composite schematic diagram, physical diagram and related characterization