Investigation of dispersion and rheological behaviors of carbon nanotube-reinforced polymers for multiscale composite processing

Jingjing Qiu, Chuck Zhang, Ben Wang, Richard Liang

Research output: Contribution to journalConference article

Abstract

Properties of carbon nanotube-reinforced polymer composites have been under intense investigation because of the remarkable physical properties of carbon nanotubes (CNTs) as reinforcing additives. The pursuit of well-dispersed CNTs in a polymer matrix is among the challenges that still hinder the development of high-performance multiscale composites. This study investigates the rheological behaviors of CNT/polymer suspensions. Shear-thinning was observed in CNT/polymer suspensions. This study indicated that the percolated structure is generated due to the high aspect ratio and surface area of CNTs. The effects of CNT concentrations on the viscosity, first normal stress and modulus were revealed. Both the inertial and visco-elastic effects were examined. The rheological threshold coincides with the threshold of the conductivity percolation. This revealed the interconnectivity of the CNTs resulting from the rheological response. The results provided a better understanding of CNT behavior in the polymer for process design and optimization for CNT-reinforced polymer composite fabrication.

Original languageEnglish
JournalInternational SAMPE Symposium and Exhibition (Proceedings)
Volume52
StatePublished - 2008
EventSAMPE 2008 - 52nd International SAMPE Symposium - Material and Process Innovations: Changing our World - Long Beach, CA, United States
Duration: May 18 2008May 22 2008

Keywords

  • Carbon nanotubes (CNTs)
  • Dispersion
  • Electrical conductivity
  • Rheological behavior

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