Piezoresistive response of carbon nanotubes-polyamides composites processed by extrusion
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The piezoresistive response of carbon nanotube (CNT)-polyamide composites processed by extrusion has been investigated as a function of CNT amount, polyamide 66 (PA66) / polyamide 6 (PA6) ratio, within the matrix and the masterbatch used to incorporate the CNT into the composite (PA66 masterbatch or PA6 masterbatch). The dispersion level of CNT in PA66/PA6 matrix was evaluated and related with the thermal, electrical and electromechanical properties. It is concluded that the inclusion of the CNT in the PA6 masterbatch helps to improve dispersion leading to larger values of the electrical conductivity in the composites prepared with larger PA66 content. On the other hand, the Gauge Factor (GF), which provides the sensitivity of a piezoresistive sensor, is larger for composites prepared from the PA66 masterbatch. The increase of PA66 content improving also the electromechanical response and GF reaches values up to 6. This fact demonstrates the suitability of the materials for sensor applications produced in an up-scaled production way.
KeywordsPiezoresistive Gauge factor Carbon nanotubes composites Polyamides
Authors acknowledge the financial support to MINECO-FEDER (research project IPT-420000-2010-004) and Xunta de Galicia-FEDER (Program of Consolidation and structuring competitive research units (CN2011/008).
L. Arboleda gratefully acknowledges financial support from Education Ministry with the program “Grants for students mobility stays for doctoral formation institutional strategies in Universities and consolidation of Doctorates programs with Excellence Mention”.
Furthermore, this work was supported by FEDER through the COMPETE Program and by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Project PEST-C/FIS/UI607/2011 and project PTDC/CTM-NAN/112574/2009. PC and AF also acknowledge FCT for the SFRH/BD/64267/2009 and SFRH/BD/69796/2010 grants, respectively. The authors also thank funding from Matepro –Optimizing Materials and Processes”, ref. NORTE-07-0124-FEDER-000037”, co-funded by the “Programa Operacional Regional do Norte” (ON.2 – O Novo Norte), under the “Quadro de Referência Estratégico Nacional” (QREN), through the “Fundo Europeu de Desenvolvimento Regional” (FEDER). Support from the COST Action MP1003, 2010 ‘European Scientific Network for Artificial Muscles’ and MP0902 “Composites of Inorganic Nanotubes and Polymers, COINAPO” is also acknowledged.
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