Abstract
This study examines the piezoresistive behavior of polymer–carbon nanotube composites.Piezoresistive composites of poly(dimethyl-siloxane) (PDMS) and poly(ethylene) (PE) filledwith multiwall carbon nanotubes (MWNTs) were prepared. The morphology and theelectrical conductivity of the composites were characterized at various MWNTcompositions. The percolation threshold was found to be 3 wt% for PDMS composites and2.2 wt% for PE composites. The piezoresistive behavior under compression was measuredusing a setup comprised of a mechanical tester and a digital sourcemeter. Negativepiezoresistive behavior was observed, signifying a reducing mean interparticulate distancein the composites. The PE–MWNT composites were found to be more sensitivethan the PDMS composites (97% versus 78% change in resistance), which wasattributed to the dissimilar morphologies as a result of difference in processing.Increasing the MWNT concentration in the PE composites resulted in decreasing thesensitivity to stress. The results were found to fit well to a modified version of apiezoresistance model. PDMS and PE composites were found to have differentpiezoresistance behavior during stress relaxation and cyclic loading. The resistance ofPE, in comparison to PDMS, was less prone to changes in stress during stressrelaxation and exhibited greater sensitivity and less drift during cyclic loading.
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