Graph of Graphene Epoxy Composites and Its Thermal Conductivity Variation with Temperature
As a research hotspot in the field of nanoscience recently, the emerging graphene has received extensive attention due to its unique two-dimensional structure, high specific surface area, and excellent thermal properties (thermal conductivity up to 3000-6000W/(mK)). Graphene/polymer thermally conductive composites are expected to find important applications in electronic devices, optoelectronic devices, consumer electronics, and thermally conductive polymer materials. At present, the addition of graphene improves the thermal conductivity of the polymer composite system to a certain extent. Although the thermal conductivity of the polymer can be increased by an order of magnitude, the amount of graphene added, the disordered structure, and the high interface thermal resistance of the graphene/polymer are increased. As a result, the thermal conductivity of the graphene-polymer composite system cannot achieve a higher breakthrough, which hinders its wide application in future thermal management.
The team of Liu Liwei, a member of the Institute of Nanotechnology and Nano-Bionics Institute of the Chinese Academy of Sciences in collaboration with Suzhou Gryphon Nanotechnology Co., Ltd., has made new progress in the thermal conductivity of directional assembly of three-dimensional graphene and polymer composite systems. A high-quality thin-layer graphene material is used as a highly thermally conductive filler, and a high-quality thin-layer graphene is formed into an oriented three-dimensional array in a polymer matrix through structural control, and a high-quality thin-layer graphene is used as a filler. Anisotropic high thermal conductivity composites.
The high filling amount of graphene is fully overlapped, reducing the interface thermal resistance. In the direction of preferred orientation, the thermal conductivity of the composite can be as high as 33 W/(mK), and the thermal conductivity exceeds some common alloys such as stainless steel and bronze (about 16.7 W/(mK) and 26.2 W/(mK)). The carbon nanomaterial-polymer composites with the highest thermal conductivity to date have great potential in the field of thermal conduction applications. The relevant results were published in Chem. Mater. 26, 4459 (2014).
This work has received substantial funding from the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Suzhou Nanotechnologies Project, and has received technical support from the Suzhou Nano Institute for testing and processing platforms.
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