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Orientation of Carbon Nanotubes in a Sheared Polymer Melt

Published

Author(s)

Erik K. Hobbie, Haonan Wang, H W. Kim, Sheng Lin-Gibson, E A. Grulke

Abstract

Optical measurements of the shear response of dilute ensembles of multi-walled carbon nanotubes dispersed in a polybutadiene melt are presented. At low shear stress, the measurements suggest that the tubes are broadly oriented along the direction of flow. Above a critical shear stress (sc 12 kPa), the data suggest a transition in which the tubes become broadly oriented along the vorticity direction. The elastic stress present in the melt at sc (as measured by the first normal stress difference) is roughly a factor of five smaller than the shear stress, suggesting that the melt is weakly elastic. The observed vorticity alignment is in qualitative agreement with previous studies of fiber orientation in weakly elastic fluids under shear.
Citation
Physics of Fluids
Volume
15
Issue
No. 5

Keywords

multi-walled carbon nanotubes, polarized light scattering, polymer melt, shear flow

Citation

Hobbie, E. , Wang, H. , Kim, H. , Lin-Gibson, S. and Grulke, E. (2003), Orientation of Carbon Nanotubes in a Sheared Polymer Melt, Physics of Fluids, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852071 (Accessed July 14, 2024)

Issues

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Created April 30, 2003, Updated October 12, 2021