Dispersion of multi-walled carbon nanotubes in PDMS/PB blend

Joung Sook Hong, Chongyoup Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)955-964
Number of pages10
JournalRheologica Acta
Volume50
Issue number11-12
DOIs
Publication statusPublished - 2011 Dec 1

Keywords

  • CNT disentanglement
  • Extensional flow
  • Pinch-off mechanism

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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