| 초록 |
Rheological behavior of polystyrene/multi-walled carbon nanotubes (PS/MWCNT) nanocomposites containing MWCNT concentrations between 0.1wt% and 10wt% was investigated using oscillatory rheometer. The nanocomposites were prepared as following steps: dissolve the PS in solvent, dissolve the surfactant in PS solution, add the MWCNT, sonicate the solution for 5 hours, precipitate the solution into methanol, and dry in drying oven and vacuum at 80℃ for 5hours and 12 hours, respectively. For this study, the optimum conditions for dispersion of MWCNTs were systematically studied with varying processing variables such as the content of surfactants, the sonication time, solvents, the content of MWCNTs, different molecular weights of PS. FE-SEM was used to evaluate the dispersion of the MWCNTs in PS/MWCNT nanocomposites. It was found from the results that increase in viscosity of the nanocomposites was accompanied by increase in the elastic melt properties, represented by the storage modulus G’ and the loss modulus G’’. The elastic share of the nanocomposites was also increased with the increasing contents of MWCNTs. |
