Zhang Xuewei, Liu Jiang, Wang Yi, Wu Wei
Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
R Soc Open Sci. 2017 Dec 20;4(12):170769. doi: 10.1098/rsos.170769. eCollection 2017 Dec.
Carbon black (CB)-filled polypropylene (PP) with surface resistivity between 10 and 10 Ω sq is the ideal antistatic plastic material in the electronics and electric industry. However, a large amount of CB may have an adverse effect on the mechanical properties and processing performance of the material, thus an improved ternary system is developed. Blends of CB-filled PP and polyamide 6 (PA6) have been prepared by melt blending in order to obtain electrically conductive polymer composites with a low electrical percolation threshold based on the concept of double percolation. The morphological developments of these composites were studied by scanning electron microscopy. The results showed that CB particles were selectively dispersed in PA6 phases due to the good interaction and interfacial adhesion between CB and PA6. At the same CB loadings, the surface resistivity of PP/PA6/CB composite was smaller than that of PP/CB composite system, which indicated the better conductivity in the former composite. The increasing amount of PA6 in the composites changed the morphology from a typical sea-island morphology to a co-continuous morphology. What is more, with 8 wt% of CB and PP/PA6 phase ratio of 70/30 in which the PP and PA6 phases formed a co-continuous structure, the electrical conductivity of the composite peaked at 2.01 × 10 Ω sq.
表面电阻率在10至10 Ω/sq之间的炭黑（CB）填充聚丙烯（PP）是电子和电气行业理想的抗静电塑料材料。然而，大量的CB可能会对材料的机械性能和加工性能产生不利影响，因此开发了一种改进的三元体系。基于双逾渗概念，通过熔融共混制备了CB填充PP与聚酰胺6（PA6）的共混物，以获得具有低导电逾渗阈值的导电聚合物复合材料。通过扫描电子显微镜研究了这些复合材料的形态发展。结果表明，由于CB与PA6之间良好的相互作用和界面粘附力，CB颗粒选择性地分散在PA6相中。在相同的CB负载量下，PP/PA6/CB复合材料的表面电阻率低于PP/CB复合体系，这表明前者复合材料具有更好的导电性。复合材料中PA6含量的增加使形态从典型的海岛形态转变为共连续形态。此外，当CB含量为8 wt%且PP/PA6相比例为70/30（其中PP和PA6相形成共连续结构）时，复合材料的电导率达到峰值2.01 × 10 Ω/sq。
