纳米ATO/PP复合材料的结构与导电性能

Structure and Conductivity of ATO/PP Nanocomposites

分别采用超声波辅助溶液共混和熔融共混的方式制备了ATO/PP复合材料,采用扫描电镜对比分析了复合材料的微观相态结构及导电性能,采用广角X衍射及偏光显微镜研究了纳米ATO的加入对PP结晶性能的影响。结果表明:采用溶液混合并用超声辅助分散的方法使纳米ATO在PP基体中分散良好,在纳米ATO含量较低的情况下就可以获导电性能良好的复合材料;纳米ATO的加入起到了异相成核作用,使PP晶粒细化,但ATO的加入没有改变PP的结晶形态,ATO/PP纳米复合材料的结晶形态仍属于a晶型。

The ATO/PP nanocomposites were prepared by solution-mixing method assisted by high-energy sonication and melt-mixing method. Conductivity of the nanocomposites was characterized by means of surface resistivity measurements and the phase structures were investigated via SEM. The crystallization characteristics of pure PP and ATO/PP nanocomposites were investigated by WAXD and POM. Comparing with the two methods, solution method will make ATO well dispersed in the PP matrix and the obtained materials will have better conductivity. The ATO enhanced the nucleation of polypropylene crystallization and made the crystal smaller and even. But the formation of PP crystal was not changed, the formation of PP crystal in ATO/PP nanocomposites and pure PP were α-form on the whole.