Polypropylene/carbon nanotubes (PP/CNTs) nanocomposites with diﬀerent CNTs concentrations (i.e., 1, 2, 3, 5 and 7 wt%) were prepared and tested as strain gauges for structures monitoring. Such sensors were embedded in cementitious mortar prisms and tested in 3-point bending mode recording impedance variation at increasing load. First, thermal (diﬀerential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA)), mechanical (tensile tests) and morphological (FE-SEM)propertiesofnanocompositesblendswereassessed. Then,strain-sensingtestswerecarried out on PP/CNTs strips embedded in cementitious mortars. PP/CNTs nanocomposites blends with CNTs content of 1, 2 and 3 wt% did not show signiﬁcant results because these concentrations are below the electrical percolation threshold (EPT). On the contrary, PP/CNTs nanocomposites with 5 and 7 wt% of CNTs showed interesting sensing properties. In particular, the best result was highlighted for the PP/CNT nanocomposite with 5 wt% CNTs for which an average gauge factor (GF) of approx. 1400 was measured. Moreover, load-unload cycles reported a good recovery of the initial impedance. Finally, a comparison with some literature results, in terms of GF, was done demonstrating the beneﬁts deriving from the use of PP/CNTs strips as strain-gauges instead of using conductive ﬁllers in the bulk matrix.
Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring / Coppola, Bartolomeo; Di Maio, Luciano; Incarnato, Loredana; Tulliani, Jean-Marc. - In: NANOMATERIALS. - ISSN 2079-4991. - ELETTRONICO. - 10:814(2020), pp. 1-20. [10.3390/nano10040814]
|Titolo:||Preparation and Characterization of Polypropylene/Carbon Nanotubes (PP/CNTs) Nanocomposites as Potential Strain Gauges for Structural Health Monitoring|
|Data di pubblicazione:||2020|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.3390/nano10040814|
|Appare nelle tipologie:||1.1 Articolo in rivista|