Please use this identifier to cite or link to this item: https://hdl.handle.net/1822/69512

TitleFunctional piezoresistive polymer-composites based on polycarbonate and polylactic acid for deformation sensing applications
Author(s)Dios, J. R.
Gonzalo, B.
Tubio, C. R.
Cardoso, João
Gonçalves, Sérgio
Miranda, Daniel
Correia, V.
Viana, J. C.
Costa, Pedro
Lanceros-Méndez, S.
KeywordsPolymers
Solvent Casting
Smart Composites
Piezoresistive Behaviour
piezoresistive behavior
Issue date2020
PublisherWiley
JournalMacromolecular Materials and Engineering
CitationDios, J. R., Gonzalo, B., Tubio, C. R., Cardoso, J., et. al. (2020). Functional Piezoresistive Polymer‐Composites Based on Polycarbonate and Polylactic Acid for Deformation Sensing Applications. Macromolecular Materials and Engineering, 305(12), 2000379
Abstract(s)Multifunctional composites for deformation sensing applications have been developed by solvent casting based on polycarbonate (PC) and polylactic acid (PLA) reinforced with carbon nanotubes (CNT). Composites shows homogeneous filler dispersion and low percolation threshold at 0.1 and 0.06 wt% CNT content for PLA and PC, respectively. The maximum electrical conductivity obtained for the larger filler contents is two order of magnitude higher for PLA composites than for PC ones, showing that the matrix influences the electrical properties of the composites. With respect to the mechanical characteristics, the samples show a maximum strain near 40% and 2.75% for composites with 0.25 and 1 wt% CNT content for PC and PLA, respectively, decreasing for larger filler contents. Concerning the piezoresistive response, 4‐point‐bending experiments from 0.1 to 5 mm, lead to a Gauge Factor (GF) of ≈1 for PC, showing that the piezoresistive response if determined by the geometrical response. On the other hand, PLA composites show GF of ≈3, revealing also intrinsic contributions, due to the variation of the filler network upon material deformation. The resistance variation upon mechanical bending deformation shows linear response for the composites near the percolation threshold and above, for both composites. A proof‐of‐concept of the functional sensing response for applications is achieved by measuring the bending deformation of an endoscope, showing that the developed sensors can determine the bending orientation and intensity, as predicted by the simulation model applied to the endoscope
TypeArticle
URIhttps://hdl.handle.net/1822/69512
DOI10.1002/mame.202000379
ISSN1438-7492
e-ISSN1439-2054
Publisher versionhttps://onlinelibrary.wiley.com/journal/14392054
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:FUNCTIONAL AND SMART MATERIALS AND SURFACES FOR ADVANCED APPLICATIONS (2018 - ...)

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