Tensile piezoresistivity and disruption of percolation in singlewall and multiwall carbon nanotube/polyurethane composites

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• 作者：J.R. Bautista-Quijano ; F. Avil茅s ; J.V. Cauich-Rodriguez ; R. Sch枚nfelder ; A. Bachmatiuk ; T. Gemming ; M.H. R眉mmeli
• 关键词：CNTs ; Elastomeric nanocomposites ; Strain sensing ; Depercolation
• 刊名：Synthetic Metals
• 出版年：1 December, 2013
• 年：2013
• 卷：185-186
• 期：Complete
• 页码：96-102
• 全文大小：1631 K

文摘

Carbon nanotube elastomeric composite films were fabricated by solution casting using singlewall and multiwall carbon nanotubes (SWCNTs and MWCNTs) and two thermoplastic-elastomers polymer matrices, an in-house synthesized segmented polyurethane and a commercial one. The CNTs are first characterized and the electrical conductivity, mechanical properties and piezoresistive response of the SWCNT and MWCNT composites with 8 wt% are evaluated. For both polymer matrices, the electrical conductivity of composites made from MWCNTs is higher than that achieved for composites made from SWCNTs. Evaluation of the strain-electrical resistance relationship of the composites shows a dependency of the piezoresistive sensitivity on the kind of CNT (SWCNT or MWCNT) and matrix electrical and mechanical properties. Above a specific strain threshold, electrical percolation is disrupted under tensile loading. The strain level at which this happens is larger for composites made with MWCNTs than for composites made with SWCNTs.