鳞片石墨填充PA66导热复合材料的性能

Research on Preparation and Properties of PA66 Composite Filled with Flake Graphite

利用鳞片石墨(FG)的高导热性能,采用熔融共混法将鳞片石墨填充于聚酰胺66(PA66)中,制备出FG/PA66导热复合材料,研究了石墨填充量以及粒径对复合材料导热性能和力学性能的影响。研究表明:随着FG填充量的增加,复合材料的导热率显著增加,而力学性能逐渐降低。当填充量为50%时,导热率达到了3.07 W/(m·K),是纯PA66的12.3倍。力学性能在50%填充量时为最小值,拉伸强度和冲击强度分别为59.3 MPa和3.03 kJ/m^2。在相同填充量下,复合材料的导热率随着粒径增大而增大,当鳞片石墨的填充量为40%,填料粒径为150μm时,导热率达到最大值,为2.38 W/(m·K)。力学性能随粒径变化呈现先增大后减小的趋势,当粒径为100μm时,复合材料的力学性能最佳。

The composite of flake graphite （FG）/Polyamide 66 （PA66） was prepared by the melt blending method. The effects of filler content and particle size on the thermal conductivity and mechanical properties of the composite were investigated. The result showed that with the increase of FG loading content, the thermal conductivity of the composite increased significantly, while the mechanical properties were gradually reduced. When the FG content was 50% , thermal conductivity reached to 3.07 W/（ m·K） , nearly 12.3 times as high as that of pure PA66. While the minimum value of tensile strength and impact strength were obtained, which were 59.3 MPa and 3.03 kJ/m^2. At the same content, with the increase of particle size of the FG, thermal conductivity of composite improved, but mechanical properties showed a trend of decrease after the first increase. When the particle size of FG was 150 μm, thermal conductivity reached to maximum value of 2. 38 W/（m·K） at 40% loading. However, the optimum mechanical properties of the composite were obtained at 100 μm.