膨胀石墨/聚丙烯纳米复合材料的电导性能

Electrical Conductivity of Expanded Graphite/Polypropylene Nanocomposites

对二次插层膨胀石墨进行超声波剥离和机械球磨制备纳米石墨片,采用溶液法制备膨胀石墨/聚丙烯纳米复合材料。重点研究了复合物的成型方法、各向异性、冷却速度和纳米石墨片的纵横比对复合物电导性能的影响。研究表明,采用模压成型和慢速冷却,以及沿复合物平面方向,均具有良好的电导性能。此外,降低纳米石墨片的纵横比也有利于提高复合物的电导性能。在最优工艺条件下,这种纳米复合材料的渗透阈值可低至0.3%。

Graphite nanosheets were prepared by sonieating and ball-milling re-intercalating expanded graphite, and expanded graphite/ polypropylene nanoeomposites were fabricated by solution method. The affecting factors on the electrical conductivity of nanocomposites were investigated, including the molding method, cooling rate and anisoptropy of nanoeomposites, as well as the aspect ratio of graphite nanosheets. The results show that, using compression molding and slow cooling rate, as well as along the plane direction of nanocomposites have better eleetrical conductivity. In addition, decreasing the aspect ratio of graphite nanosheets is helpful for the electrical conductivity of nanocomposites. Under the optimized conditions, the percolation threshold of nanocomposites reduces to 0.3%.