Oriented high thermal conductivity carbon/polymer composite material and preparation method

Abstract

The invention relates to a carbon / polymer composite material along a specific direction and a preparation method thereof; preparing a triiron tetroxide precursor solution with a mass fraction of iron of 0.05% to 5%; Mix evenly, react, filter, wash, and dry to obtain a magnetic carbon material in which ferric oxide is uniformly dispersed on the surface of the carbon material; place the magnetic carbon material in a magnetic field of 0.1-1T, and the direction of the magnetic field is from the N pole to the S pole , by adjusting the relative position of N pole and S pole to obtain different magnetic field directions, the magnetic carbon materials are oriented along the magnetic field direction; the polymer precursor solution is poured into the oriented carbon material array, and the carbon material is obtained after curing. Aligned carbon / polymer composites. The surface of the carbon material is loaded with ferroferric oxide, and it is aligned along the direction of the magnetic field in the magnetic field; the thermal conductivity of the composite material along the direction of the orientation of the carbon material is ≧30W / (m·K).

Description

technical field [0001] The invention relates to a carbon / polymer composite material with high thermal conductivity along a specific direction and a preparation method, in particular to a method for controlling the orientation of a thermally conductive carbon material and compounding it with a polymer. Background technique [0002] With the rapid development of science and technology, efficient heat conduction and heat dissipation have become key issues in the field of thermal management. With the continuous improvement of the integration and precision of electronic components in electrical devices such as computers, mobile phones, and satellites, the increasing heat generated by electronic devices per unit area has caused a sudden increase in the heat generated by the system. If the heat cannot be quickly dissipated, it will form a large temperature difference with the local materials, which will affect the normal operation of the device. Studies have shown that the stabili...

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Problems solved by technology

This is due to the great thermal anisotropy of the thermally conductive filler itself, and the thermal conductivity along the vertical crystal plane is less than 10W / mK. At the same time, it is randomly oriented in the polymer matrix, and it is difficult to form an effective thermal conduction channel between the thermally conductive fillers. There is a large interface thermal resistance, which greatly limits the improvement of the thermal conductivity of composite materials (Vivek Goyal, Alexander A. Balandin. Thermal properties of the hybrid graphene-metal nano-micro-composites: Applications in thermal interface materials. Applied Physics Letters 100( 2012):073113)

[0005] In summary, thermally conductive carbon materials can be combined with most polymers to prepare carbon / polymer composites, but in current reports, carbon materials are randomly oriented in polymers, so their thermal conductivity is isotropic , and the thermal conductivity is very low

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