Effect of preparation method of multi-walled carbon nanotube/poly(methyl methacrylate) nanocomposite on its characteristics.

Multi-walled carbon nanotube (MWNTs)/poly(methyl methacrylate) (PMMA) nanocomposites were prepared by both coagulation and solvent casting methods in this study. Dispersibility of the MWNTs in the PMMA matrix was compared with each other using both scanning electron microscopy (SEM) and photograph. MWNTs from the solvent casting method were found to be dispersed better in the matrix, indicating that the dispersion state of the MWNTs depends on the preparation procedure. Moreover, using a stress-controlled rotational rheometer we investigated their rheological properties under small amplitude oscillation in their melt state. Well dispersed MWNTs in the PMMA matrix prepared by the solvent casting method efficiently blocked energy dissipation and relaxation of the PMMA chains, resulting in a lower tan delta with increased solid-like property.