Abstract

The impact of small amounts of carboxyl-functionalized multi-walled carbon nanotubes (MWCNT-COOH) added into a polyether-based thermoplastic polyurethane elastomer (TPU) was studied considering mainly on the morphological, mechanical, electrical and electrostrictive properties. The electrostrictive properties were measured by the analysis of the deformation response occurring under external electric fields E applied on 50 μm-thick films. Dielectric measurements were carried out in order to determine the percolation threshold fc, which was found near 1 v% loading. This volume fraction leads to a very high dielectric permittivity εr′ up to ≈330, i.e. about 50 times higher than that of the pure TPU, where εr′≈6–7.

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