effect of nanoparticles concentration on electrical conductivity of a tpu/mwcnt nanocomposite

Abstract conductive thermoplastic nanocomposites are an interesting class of materials with various high-tech applications. the aim of this research is to investigate the effect of multi-walled carbon nanotube (mwcnt) concentration on the electrical conductivity of a thermoplastic polyurethane (tpu)/mwcnt. the electrical percolation threshold was found to be at 0.5 wt. % of mwcnt in a tpu comprised of poly(tetramethylene ether)glycol, 4,4 -methylene di(phenyl isocyanate), and butanediol. at the mentioned nanoparticle concentration, the electrical conductivity of the nanocomposite was more than 100 times that of the neat tpu. moreover, the low-frequency plateau of electrical conductivity extended to higher frequencies at higher nanoparticle concentration.