Piezoresistive characteristics of single wall carbon nanotube/polyimide nanocomposites

A systematic study of the effect of single wall carbon nanotubes (SWCNTs) on the enhanced piezoresistive sensitivity of polyimide nanocomposites from below to above percolation was accomplished. The maximum piezoresistive stress coefficient (Π) of 1.52 x 10⁻³ MPa⁻¹ was noted at just above the percol...

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Bibliographic Details
Published in:Journal of polymer science. Part B, Polymer physics Polymer physics, 2009-05, Vol.47 (10), p.994-1003
Main Authors: Kang, Jin Ho, Park, Cheol, Scholl, Jonathan A, Brazin, Amy H, Holloway, Nancy M, High, James W, Lowther, Sharon E, Harrison, Joycelyn S
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
carbon nanotubes
Coefficients
Composites
Compressing
Electrical resistivity
Exact sciences and technology
Forms of application and semi-finished materials
high performance polymers
Nanocomposites
Percolation
piezoresistance
Polyimide resins
polyimides
Polymer industry, paints, wood
Single wall carbon nanotubes
Technology of polymers
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Summary:A systematic study of the effect of single wall carbon nanotubes (SWCNTs) on the enhanced piezoresistive sensitivity of polyimide nanocomposites from below to above percolation was accomplished. The maximum piezoresistive stress coefficient (Π) of 1.52 x 10⁻³ MPa⁻¹ was noted at just above the percolation threshold concentration (Φ ~ 0.05 wt %) of SWCNT. This coefficient value exceeds those of metallic piezoresistive materials by two orders of magnitude (4.25 x 10⁻⁵ MPa⁻¹ for aluminum). The high piezoresistive characteristics appear to originate from a change in the intrinsic resistivity of the composite caused by the variation of the tunneling distance between conducting inclusions (SWCNTs) under compression or tension.
ISSN:0887-6266
1099-0488
1099-0488
DOI:10.1002/polb.21705