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Open AccessArticle

Piezoresistive Behaviour of Additively Manufactured Multi-Walled Carbon Nanotube/Thermoplastic Polyurethane Nanocomposites

1
School of Mechanical Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Busan 46241, Korea
2
Division of Advanced Materials, Korea Research Institute of Chemical Technology, 141 Gajeongro, Daejeon 305-600, Korea
3
School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2019, 12(16), 2613; https://doi.org/10.3390/ma12162613
Received: 21 June 2019 / Revised: 9 August 2019 / Accepted: 14 August 2019 / Published: 16 August 2019
(This article belongs to the Special Issue Additive Manufacturing of Fiber Composites)

Abstract

To develop highly sensitive flexible pressure sensors, the mechanical and piezoresistive properties of conductive thermoplastic materials produced via additive manufacturing technology were investigated. Multi-walled carbon nanotubes (MWCNTs) dispersed in thermoplastic polyurethane (TPU), which is flexible and pliable, were used to form filaments. Specimens of the MWCNT/TPU composite with various MWCNT concentrations were printed using fused deposition modelling. Uniaxial tensile tests were conducted, while the mechanical and piezoresistive properties of the MWCNT/TPU composites were measured. To predict the piezoresistive behaviour of the composites, a microscale 3D resistance network model was developed. In addition, a continuum piezoresistive model was proposed for large-scale simulations. View Full-Text
Keywords: 3D printing; fused deposition modelling; conductive polymer composite; piezoresistivity; 3D resistance network model 3D printing; fused deposition modelling; conductive polymer composite; piezoresistivity; 3D resistance network model
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Kim, M.; Jung, J.; Jung, S.; Moon, Y.H.; Kim, D.-H.; Kim, J.H. Piezoresistive Behaviour of Additively Manufactured Multi-Walled Carbon Nanotube/Thermoplastic Polyurethane Nanocomposites. Materials 2019, 12, 2613.

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