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Mechanical, electrical and electro-mechanical properties of thermoplastic elastomer styrene–butadiene–styrene/multiwall carbon nanotubes composites

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Abstract

Composites of styrene–butadiene–styrene (SBS) block copolymer with multiwall carbon nanotubes were processed by solution casting to investigate the influence of filler content, the different ratios of styrene/butadiene in the copolymer and the architecture of the SBS matrix on the electrical, mechanical and electro-mechanical properties of the composites. It was found that filler content and elastomer matrix architecture influence the percolation threshold and consequently the overall composite electrical conductivity. The mechanical properties are mainly affected by the styrene and filler content. Hopping between nearest fillers is proposed as the main mechanism for the composite conduction. The variation of the electrical resistivity is linear with the deformation. This fact, together with the gauge factor values in the range of 2–18, results in appropriate composites to be used as (large) deformation sensors.

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Acknowledgements

This study was funded by FEDER funds through the ‘Programa Operacional Factores de Competitividade—COMPETE’ and by national funds by FCT—Fundação para a Ciência e a Tecnologia, through project references PTDC/CTM/69316/2006, PTDC/CTM/73465/2006, PTDC/CTM-NAN/112574/2009, and NANO/NMed-SD/0156/2007. PC, JS and VS also thank FCT for the SFRH/BD/64267/2009, SFRH/BD/60623/2009 and SFRH/BPD/63148/2009 Grants, respectively. The authors also thank support from the COST Action MP1003 ‘European Scientific Network for Artificial Muscles’ and the COST action MP0902 ‘Composites of Inorganic Nanotubes and Polymers (COINAPO)’.

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Authors and Affiliations

  1. Centro/Departamento de Física da Universidade do Minho, 4710-058, Braga, Portugal

    P. Costa, J. Silva, V. Sencadas & S. Lanceros-Méndez

  2. Institute for Polymers and Composites IPC/I3N, University of Minho, 4800-058, Guimarães, Portugal

    J. Silva, R. Simoes & J. C. Viana

  3. School of Technology, Polytechnic Institute of Cávado and Ave, Campus do IPCA, 4750-810, Barcelos, Portugal

    V. Sencadas & R. Simoes

  4. INL – International Iberian Nanotechnology Laboratory, 4715‐330, Braga, Portugal

    S. Lanceros-Méndez

Authors
  1. P. Costa
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  2. J. Silva
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  3. V. Sencadas
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  4. R. Simoes
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  6. S. Lanceros-Méndez
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Correspondence to S. Lanceros-Méndez.

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Costa, P., Silva, J., Sencadas, V. et al. Mechanical, electrical and electro-mechanical properties of thermoplastic elastomer styrene–butadiene–styrene/multiwall carbon nanotubes composites. J Mater Sci 48, 1172–1179 (2013). https://doi.org/10.1007/s10853-012-6855-7

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  • DOI: https://doi.org/10.1007/s10853-012-6855-7

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