Abstract: In this paper，the research progress in carbon nanotube filled polymer based composites for electromagnetic shielding was overviewed. By explaining the need for the development of electromagnetic shielding materials，the electromagnetic shielding mechanism of composite was introduced，then attention was focused on the effect of carbon nanotube addition，aspect ratio and diameter，the thickness of the shield，composite processing on the electromagnetic shielding performance of the composites. Finally，the prospect of the future research trend of carbon nanotube filled polymer based composites for electromagnetic shielding was given：the addition of low-cost filler could have a synergistic effect or not with carbon nanotube；how to design the preparation process to solve the dispersion of carbon nanotube；based on the microscopic structure of carbon nanotube，enrich the theoretical content of the electromagnetic shielding mechanism of composite；how to control the addition amount of carbon nanotube，making the absorption as the main shielding mode.

Key words: carbon nanotube, polymer, electromagnetic shielding, addition, aspect ratio, diameter

摘要： 对碳纳米管填充聚合物基电磁屏蔽复合材料的研究进展进行了综述。在阐述研究电磁屏蔽材料必要性的基础上，介绍了复合材料的电磁屏蔽机理，重点论述了碳纳米管填充量、长径比及管径、屏蔽体的厚度、复合材料的加工方式等对复合材料电磁屏蔽性能的影响。最后对碳纳米管填充聚合物基复合电磁屏蔽材料的研究进行了展望，指出低成本填料与碳纳米管协同作用、可提高碳纳米管分散性的制备工艺的研究以及复合材料电磁屏蔽机理的研究等为未来的研究方向。

关键词: 碳纳米管, 聚合物, 电磁屏蔽效能, 填充量, 长径比, 管径