Dispersion of multi-walled carbon nanotubes in PDMS/PB blend |
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Authors: | Joung Sook Hong Chongyoup Kim |
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Institution: | 1. Department of Chemical Engineering, Soongsil University, Sangdo-dong, Dongjak-ku, Seoul, 156?C743, Korea 2. Department of Chemical and Biological Engineering, Korea University, Anam-dong, Sungbuk-ku, Seoul, 136?C713, Korea
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Abstract: | In this study, the sequential dispersion of multi-walled carbon nanotubes (CNTs) in PDMS/PB (polydimethylsiloxane/polybutene) blends and the change of blend morphology by the dispersion of CNTs were investigated by rheological and morphological observations. The dispersion of CNTs into PDMS/PB blend was accomplished by the dilution of the CNT master (2?wt.% CNT in PDMS) in PDMS/PB blend using an extensional mixer. The morphological study shows that under the extensional flow, CNTs in the dispersed CNT master phase are mainly broken up by tip-streaming and the continuous pinching-off of PDMS drops during morphology evolution enhances the dispersion of CNT. It has been shown that CNTs can be disentangled as in the case of dispersing CNTs in a Boger fluid. Rheological data and TEM observations show that it is not simply a mixing of two phases and the CNTs in the master phase can be dispersed in the single CNT level. |
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