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通过混炼工艺制备了片状Al2O3填充聚全氟乙丙烯(FEP)复合材料,以颗粒状Al2O3为对比样品,研究了片状Al2O3形状和尺寸对FEP基复合材料热导率的影响,利用SEM观察了FEP基复合材料的微观形貌。结果表明:在低填充量下,Al2O3颗粒在FEP基体中呈“海岛”状分布,没有形成连续的导热网链,但其热导率明显提高;复合材料拉伸强度与断裂伸长率随Al2O3含量的增加而减小;低填充量时复合材料热导率的提高主要来自Al2O3的微细片状结构,这种微细片状结构一方面提高了有效导热路径,另一方面增加了颗粒与基体之间接触面积,因此有利于热导率的提高。
Flake Al2O3-filled FEP composites were prepared by a mixing process. The effects of the shape and size of flake Al2O3 on the thermal conductivity of FEP-based composites were investigated by using particulate Al2O3 as a control. SEM, The microstructure of FEP-based composites was observed. The results show that Al2O3 particles are distributed in “islands” in the FEP matrix at low loading, and no continuous heat conduction network chain is formed, but the thermal conductivity of the particles is obviously increased. The tensile strength and elongation at break Which decreases with the increase of Al2O3 content. The increase of thermal conductivity of composites at low loading mainly comes from the fine flake structure of Al2O3. This fine flake structure enhances the effective thermal conduction path on the one hand, The contact area between the substrates therefore contributes to the improvement of the thermal conductivity.