| 초록 |
There are a few types of nanoscaled carbon compounds. The one is carbon nanoparticle, carbon nanotube, and graphite. Their outstanding properties have been expected and used as reinforcing additives. The resultant nanocomposites are thus expected to possess enhanced properties. However, to achieve maximum enhanced physical properties through such nanoscale additives, there are two fundamental issues needed to be addressed first, and they are related to (i) the effective aspect ratio, largely determined by the state of dispersion and (ii) interfacial adhesion between additives and matrix. Thus, there have been many efforts to provide homogeneous dispersion of nanoscale carbon materials in various matrix systems. However, a homogeneous dispersion has been the most difficult to achieve due to strong interaction between them. Especially, graphite, which is two-dimensional carbon nano material, is one of the most difficult carbon forms to be exfoliated. The attempt on covalent functionalization of graphite would be the greatest challenge in the field of nanoscale carbon materials. Thus, we have tried to exfoliate graphite sheets after functionalization via electrophilic substitution reaction, which we established on carbon nanotubes (CNTs). Our preliminary results from solubility and SEM images showed that graphite sheets could also be functionalized and partially exfoliated in significant degree. |
