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Authors Bautista-Quijano, J. R. ; Avilés, F. ; Cauich-Rodriguez, J. V. ; Pötschke, P.
Title Multiwall carbon nanotube/segmented polyurethane composites with large strain sensing capabilities
Date 30.09.2013
Number 39754
Abstract Polymer composites filled with multiwall carbon nanotubes (MWCNT) have been proven to be suitable for many applications as sensor materials. Among their applications strain sensing is one of the most studied nowadays. Even when MWCNT/polymer composites have strain sensing capabilities (electromechanical coupling), they mostly have the drawback of a low range of strain sensing capability. This is due to the fact that for developing such kind of <br />sensor in most cases thermoplastic and thermosets are used which show high mechanical properties, good processability and thermal stability, but their strain capability is usually low. On the other hand, thermoplastic elastomers like segmented polyurethanes (SPU), have the processability of thermoplastics and the high stretchability of elastomers. In the present work two SPU were used for fabricating MWCNT/elastomeric composite films: an in-house synthesized one (IH-SPU) and a commercial medical grade (Tecoflex, TF). Electrical, mechanical, and electromechanical (piezoresistive) properties were evaluated as a function of the MWCNT concentration (1–10 wt %) for both matrices. MWCNT/TF composites showed <br />higher electrical conductivity than MWCNT/IH-SPU composites. A threefold increase in stiffness was observed when adding 8 wt % MWCNT to SPU. It was possible to measure strains up to ~400% before electrical depercolation occurs by obtaining the piezoresistive signal of the composites [1]. A dependency was found between the conductivity of the composite in its unloaded state and the strain at which electrical depercolation occurs. <br /><br />Meeting-Abstract<br />CNPComp 2013, 6th International Conference on Carbon NanoParticle Based Composites, Dresden, September 22 to 25, 2013<br />ISBN 978-3-9816007-0-4
Publisher CNPComp 2013
Wikidata
Citation CNPComp 2013 (2013) P47
DOI http://www.ipfdd.de/CNPComp2013.2320.0.html
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