| 초록 |
So far, there were few reports on the melt rheological behaviors of multi-walled carbon nanotubes (MWNTs)-filled polymers. Therefore, the purpose of this work was to examine the rheological behaviors of MWNTs-filled polypropylene nanocomposites formed by melt mixing process. The influence of nanotube contents on complex viscosity, storage (G′) and loss modulus (G″), and tanδ were examined using oscillatory rheometry at a constant temperature of 260℃. Also, the tensile elastic modulus and damping properties of the composites were studied in a dynamic mechanical thermal analysis (DMTA) as functions of nanotube loading and temperature. As a result, the viscosity of the composites was increased with the addition of nanotubes and accompanied by an increase in the elastic melt properties (G′), which could be probably explained by the higher aspect ratio of the nanotubes. Also, from the DMTA results, the storage modulus of the composites was significantly increased by the incorporation of nanotubes particularly at high temperatures. And the tanδ peak of the composites showed some broadening and moved to a slightly higher temperature with increasing nanotube content, resulting from increasing the Tg of the composites.
|
