High-directional-thermal-conductivity carbon/polymer composite material and preparation method

Abstract

The invention relates to a carbon / polymer composite material in a specific direction and a preparation method. A ferroferric oxide precursor solution containing 0.05-5% by mass of iron is prepared; a thermally conductive carbon material is uniformly mixed with the ferroferric oxide precursor solution, and reaction, filtration, washing and drying are performed to obtain a magnetic carbon material with ferroferric oxide uniformly dispersed on the surface of the carbon material; the magnetic carbon material is put in a magnetic field of 0.1-1 T, the direction of the magnetic field is from an N pole to an S pole, different magnetic field directions are obtained by regulating relative positions of the N pole and the S pole, and the magnetic carbon material is arranged in the magnetic field direction; and a polymer precursor solution is poured in a directional carbon material array and cured to obtain the carbon / polymer composite material with the carbon material directionally arranged in polymer. The surface of the carbon material is loaded with ferroferric oxide, and the carbon material is directionally arranged in the magnetic field direction in the magnetic field; and the thermal conductivity coefficient of the composite material in the carbon material direction is greater than or equal to 30 W / (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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