Lignin-based polyurethane doped with carbon nanotubes for sensor applications
authors Faria, FAC; Evtuguin, DV; Rudnitskaya, A; Gomes, MTSR; Oliveira, JABP; Graca, MPF; Costa, LC
nationality International
author keywords kraft lignin; polyurethane; carbon nanotubes; nanocomposites; chemical sensors
abstract Modified eucalyptus kraft lignin doped with multiwall carbon nanotubes (MWCNTs) was used as a macromonomer in step-growth polymerization with tolylene 2,4-diisocyanate terminated poly(propylene glycol) with the aim of producing a conductive copolymer for all-solid-state potentiometric chemical sensor applications. The crosslinked elastomeric polyurethane obtained was characterized by Fourier transform infrared attenuated total reflection spectroscopy, scanning electron microscopy, tunnelling electron microscopy and atomic force microscopy. Doping of lignin-based polyurethane with MWCNTs produced a significant enhancement of its electrical conductivity without deterioration of thermal and viscoelastic properties. The polymer composite displayed a low percolation threshold at an MWCNT concentration of 0.18% (w/w), which was explained by the oriented distribution of MWCNTs along lignin clusters. All lignin-based polyurethanes doped with MWCNTs at concentrations above the percolation threshold are suitable for sensor applications. Copyright (c) 2012 Society of Chemical Industry
issn 0959-8103
year published 2012
volume 61
issue 5
beginning page 788
ending page 794
digital object identifier (doi) 10.1002/pi.4140
web of science category Polymer Science
subject category Polymer Science
unique article identifier WOS:000302541200017
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journal impact factor 2.574
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