Pécastaings G, Delhaès P, Derré A, Saadaoui H, Carmona F, Cui S
Centre de Recherche Paul Pascal-CNRS and Bordeaux I University 115, Avenue du Dr. A. Schweitzer Pessac 33600, France.
J Nanosci Nanotechnol. 2004 Sep;4(7):838-43. doi: 10.1166/jnn.2004.114.
The interfacial effects are critical to understand the nanocomposite behavior based on polymer matrices. These effects are dependent upon the morphology of carbon nanotubes, the type of used polymer and the processing technique. Indeed, we show that the different parameters, as the eventual surfactant use, the ultrasonic treatment and shear mixing have to be carefully examined, in particular, for nanotube dispersion and their possible alignment. A series of multiwalled nanotubes (MWNT) have been mixed with a regular epoxy resin under a controlled way to prepare nanocomposites. The influence of nanotube content is examined through helium bulk density, glass transition temperature of the matrix and direct current electrical conductivity measurements. These results, including the value of the percolation threshold, are analyzed in relationship with the mesostructural organization of these nanotubes, which is observed by standard and conductive probe atomic force microscopy (AFM) measurements. The wrapping effect of the organic matrix along the nanotubes is evidenced and analyzed to get a better understanding of the final composite characteristics, in particular, for eventually reinforcing the matrix without covalent bonding.
界面效应对于理解基于聚合物基体的纳米复合材料行为至关重要。这些效应取决于碳纳米管的形态、所用聚合物的类型以及加工技术。事实上，我们表明，对于纳米管的分散及其可能的排列，必须仔细研究不同的参数，特别是最终使用的表面活性剂、超声处理和剪切混合。一系列多壁纳米管（MWNT）已在受控条件下与常规环氧树脂混合以制备纳米复合材料。通过氦气堆积密度、基体的玻璃化转变温度和直流电导率测量来研究纳米管含量的影响。这些结果，包括渗流阈值的值，与这些纳米管的介观结构组织相关联进行分析，这是通过标准和导电探针原子力显微镜（AFM）测量观察到的。有机基体沿纳米管的包裹效应得到了证实和分析，以便更好地理解最终复合材料的特性，特别是对于最终在不进行共价键合的情况下增强基体。
