Self-Sensing Carbon Nanotube Composites Exposed to Glass Transition Temperature

This paper reported the effect of high temperature on the electro-mechanical behavior of carbon nanotube (CNT) reinforced epoxy composites. CNT/epoxy composites were fabricated by dispersing CNTs in the epoxy matrix using a solution casting method. Electrical conductivity measurements obtained for t...

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Bibliographic Details
Published in:Materials 2020-01, Vol.13 (2), p.259
Main Authors: Jang, Sung-Hwan, Li, Long-Yuan
Format: Article
Language:English
Subjects:
Carbon
Carbon nanotubes
Composite materials
Electrical resistivity
Epoxy matrix composites
Epoxy resins
Glass transition temperature
High temperature effects
Mechanical properties
Nanocomposites
Percolation
Reproducibility
Room temperature
Viscosity
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Summary:This paper reported the effect of high temperature on the electro-mechanical behavior of carbon nanotube (CNT) reinforced epoxy composites. CNT/epoxy composites were fabricated by dispersing CNTs in the epoxy matrix using a solution casting method. Electrical conductivity measurements obtained for the CNT/epoxy composites indicated a steadily increasing directly proportional relationship with CNT concentration with a percolation threshold at 0.25 wt %, reaching a maximum of up to 0.01 S/m at 2.00 wt % CNTs. The electro-mechanical behavior of CNT/epoxy composites were investigated at a room temperature under the static and cyclic compressive loadings, resulting that the change in resistance of CNT/epoxy composites was reduced as increasing CNT concentration with good repeatability. This is due to well-networked CNTs conducting pathways created within the solid epoxy matrix observed by scanning electron microscopy. Temperature significantly affects the electro-mechanical behavior of CNT/epoxy composites. In particular, the electro-mechanical behavior of CNT/epoxy composites below the glass transition temperature showed the similar trend with those at room temperature, whereas the electro-mechanical behavior of CNT/epoxy composites above the glass transition temperature showed an opposite change in resistance with poor repeatability due to unstable CNT network in epoxy matrix.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13020259