Instituto de Carboquímica (CSIC), Department of Nanotechnology, C/ Miguel Luesma Castán 4, 50018 Zaragoza, Spain.
J Phys Chem B. 2010 Feb 4;114(4):1579-85. doi: 10.1021/jp909093e.
A straightforward, template-free chemical oxidative polymerization of aniline was used to prepare nanofibrillar polyaniline (nf-PANI) and a set of corresponding composites with multiwall carbon nanotubes (MWNTs). All the products showed remarkable water dispersibility since they are formed by hydrophilic particles of nanometric size. A comparative study performed on composites in a wide range of MWNT loadings has led to two main conclusions: on one hand, the presence of MWNTs affects neither the chemical structure nor the crystallinity of polyaniline. On the other hand, even small amounts of MWNTs have a significant effect on the morphology of polyaniline in composites. This effect is noticeable not only in electron microscopy images but also in the UV-vis absorbance of water dispersions and electrical conductivity behavior in the solid state. Competition between nucleation sites during polymerization is proposed as an explanation for these phenomena.
采用一种简单、无模板的苯胺化学氧化聚合方法制备了纳米纤维状聚苯胺(nf-PANI)和一系列相应的多壁碳纳米管(MWNTs)复合材料。由于这些产物由纳米级的亲水颗粒形成，因此都具有显著的水分散性。在广泛的 MWNT 负载范围内对复合材料进行的比较研究得出了两个主要结论：一方面，MWNTs 的存在既不影响聚苯胺的化学结构也不影响其结晶度。另一方面，即使少量的 MWNTs 对复合材料中聚苯胺的形态也有显著的影响。这种影响不仅在电子显微镜图像中可见，而且在水分散体的紫外-可见吸收和固态电导率行为中也可见。聚合过程中成核位点之间的竞争被提出作为这些现象的解释。
