| 초록 |
Polyester-based thermoplastic elastomer ( Hytrel ®)/multiwalled carbon nanotube (MWNT) composites with various loading levels (0.1 ~ 7 wt%) were prepared by melt-mixing using an internal mixer and their physical properties were discussed including rheological, thermal, mechanical and electrical properties. The presence of MWNTs increased the dynamic viscosity of the elastomer with the loading level and the disappearance of lower Newtonian flow region was notably observed from 1 wt% of MWNT. In addition, there was a large increase of the viscosity between 0.5 and 1 wt%. The experimental percolation threshold for the electrical conductivity was estimated and clearly occurred at around 1 wt% of MWNT. In the cooling scan of differential scanning calorimeter (DSC), the presence of MWNTs increased the crystallization temperature up to 20°C suggesting the high efficiency of heterogeneous nucleation. |
