Coupled electro-mechanical properties of multiwall carbon nanotube/polypropylene composites for strain sensing applications
The electrical, mechanical, and coupled electro-mechanical (piezoresistive) properties of multiwall carbon nanotube/polypropylene (MWCNT/PP) composites at four MWCNT concentrations above electrical percolation (4–10 wt %) were investigated. The electrical conductivity of the composite increased monotonically from 0.77 to 15.0 S/m with the increase of MWCNT concentration. The elastic modulus also increased monotonically with increased MWCNT concentration with the concomitant reduction of ultimate strain. The coupled signal between electrical resistance and applied strain during tensile loading displayed a marked change toward higher sensitivity at the elastic-to-plastic transition zone of the polymer composite, which allowed the identification of polymer yielding by the sole monitoring of electrical resistance. Large ratios (of the order of 15–29) of normalized changes in electrical resistance over applied strain (‘‘gage factor’’) were found in the plastic zone, and such electro-mechanical sensitivity was higher for composites with lower MWCNT content.
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Format: | info:eu-repo/semantics/article biblioteca |
Subjects: | info:eu-repo/classification/cti/7, |
Online Access: | http://cicy.repositorioinstitucional.mx/jspui/handle/1003/104 |
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Summary: | The electrical, mechanical, and coupled electro-mechanical
(piezoresistive) properties of multiwall
carbon nanotube/polypropylene (MWCNT/PP) composites
at four MWCNT concentrations above electrical percolation
(4–10 wt %) were investigated. The electrical conductivity
of the composite increased monotonically from
0.77 to 15.0 S/m with the increase of MWCNT concentration.
The elastic modulus also increased monotonically
with increased MWCNT concentration with the concomitant
reduction of ultimate strain. The coupled signal
between electrical resistance and applied strain during
tensile loading displayed a marked change toward higher
sensitivity at the elastic-to-plastic transition zone of the
polymer composite, which allowed the identification of
polymer yielding by the sole monitoring of electrical
resistance. Large ratios (of the order of 15–29) of normalized
changes in electrical resistance over applied strain
(‘‘gage factor’’) were found in the plastic zone, and such
electro-mechanical sensitivity was higher for composites
with lower MWCNT content. |
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