LAUSR

Abstract Dispersions of MWCNTs by an extensional batch mixer (EBM) were evaluated in PP/MWCNT and PC/MWCNT nanocomposites. The extensional batch mixer consists of two cylindrical cavities connected through a narrow rectangular channel and two cylindrical pistons. Pistons squeeze molten polymers from one cavity to the other cavity through the narrow channel. During mixing, the molten polymers flow from one cavity to the other cavity, repeatedly, and this operation generates extensional flow in the converging/diverging geometry. The electrical resistivity, morphology, and rheological properties of the nanocomposites prepared in the EBM and 11 mm co-rotating twin screw extruder were compared. The electrical resistivity of the nanocomposites prepared in the EBM was significantly lower than that of the nanocomposites prepared in the twin screw extruder. By morphological and rheological analyses, it was confirmed that this is due to enhanced dispersion of the MWCNTs by the repeated extensional flow in the EBM.