서강대학교

초록/요약

The localization of functionalized multi-walled carbon nanotubes (MWCNTs), and the electrical resistivity of MWCNT filled blend systems of polycarbonate (PC) and poly(styrene-co-acrylonitrile) (SAN) was investigated. We intended to observe the effect of the electrical conductivity and other rheological properties by changing the content of carbon nanotubes and sonication time. PC, SAN and amino-functionalized MWCNTs (Nanocyl™ NC7000) were prepared by melt mixing from a conductive Polycarbonate(PC)/Styrene-acrylonitrile(SAN) composite filled with multiwalled carbon nanotubes (MWNT). Blends were melt mixed in HAAKE RHEOMIX-600, the sonicated intensive mixer, using different sonication times. For the direct input of ultrasonic energy, ultrasonic horn was fit into the feeding section of a Haake mixer. High electrical conductivity of carbon nanotubes has roused interest in the area of electrical appliances and communication related applications. The critical weight or volume percentage of fillers required for building up a continuous electrically conductive network throughout the polymer matrix actually depends on the aggregation, structure, porosity, average size and size distribution of the conductive particles and on the polymer rheology and processing conditions as well. In this study, electrical properties of polymer blend could be improved by addition of multiwalled carbon nanotube. It was much more enhanced by high intensity ultrasounmd irradiation as well as shortened percolation threshold time. According to this idea, we could find the optimum condition manifesting synergistic effect which was investigated through various amount of CNT and ultrasound irradiation time.