| 초록 |
In this work, the nanocomposites with different multi-wall carbon nanotubes (MWNTs) contents have been fabricated by mixing of aqueous poly(vinyl alcohol) solutions (PVA) with carbon nanotube dispersions followed by subsequent casting, and controlled water evaporation. In order to investigate the effect of nanotube content on the thermal stability of the composites, thermogravimetric analysis (TGA) was performed on the MWNTs/PVA composites. The electrical conductivity of the composites was also measured using the impedance spectroscopy. As a result, there was a retardation of the onset of PVA decomposition for the composites with low nanotube loadings and temperatures, which was likely to be a result of absorption, by the activated carbon surface, of free-radicals generated during polymer decomposition. However, the stabilizing effect of the composites was diminished at higher temperatures or loading, resulting from the decomposition of the oxidized nanotube surface itself. And the experimental conductivity was increased with addition of nanotubes and found to obey a percolation-like power law with a relatively low percolation threshold.
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