Data di Pubblicazione:
2020
Abstract:
Carbon nanotubes (CNT) embedded into a polymeric foam demonstrate an enhancement
in electrical and mechanical properties of the final nanocomposite. The enhanced material with new
characteristics, e.g., piezoresistivity, can be substituted with the traditional metallic material to design
sensors, switches, and knobs directly into a single multifunctional component. Research activities
in this field are moving towards a mono-material fully integrated smarts components. In order to
achieve this goal, a simple method is developed to produce piezoresistive polyurethane/CNT foams.
The novelty consists in applying the dispersion of CNT considering industrial production constrains,
in order to facilitate its introduction into a common industrial practice. Three kinds of PU-CNT
foam have been prepared and tested: PU-CNT 1.5%, PU-CNT-COOH 1.0%, and PU-CNT-COOH
1.5%. Polyurethane with CNT-COOH showed an insulating-conductive transition phenomenon when
the foam reaches the 80% of its compression strain with a Gauge factor (Gf) of about 30. Instead,
PU-CNT showed conductivity only at 1.5% of filler concentration and a steady piezoresistive behavior
with a Gf of 80. However, this samples did not show the insulating-conductive transition. Having
improved the electromechanical properties of final nanocomposite polyurethane foam demonstrates
that the proposed method can be applied dierently for design sensors and switches.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
nanocomposite; conductive polymers; polymer-matrix composites (PMCs);
electrical properties
Elenco autori:
De Meo, Enea; Agnelli, Simone; Veca, Antonino; Brunella, Valentina; Zanetti, Marco
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