Piezo-resistance effect in composite based on cross-linked polydimethylsiloxane and polyaniline: Potential pressure sensor application

T. Del Castillo-Castro, M. M. Castillo-Ortega, J. C. Encinas, P. J. Herrera Franco, H. J. Carrillo-Escalante

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Composites that incorporate an electrically conducting filler, the hydrochloric polyaniline (PANI-Cl), into hydroxy-terminated polydimethylsiloxane (HO-PDMS) matrix were evaluated for DC electrical, mechanical, thermal, morphological and piezo-resistive properties. The main focus of the study was on the electrical-mechanical behavior of these composites in view of possible piezo-resistive sensor application. The percolation threshold of conductivity was determined to be around 11.5 wt% of PANI-Cl. Compression/expansion cyclic experiments showed that the filler content modified the stiffness, the magnitude of Mullins effect and the hysteresis behavior in elastomeric composites. The piezo-resistive response of composites differed depending on the sample composition and also, on the strain rate. Composites with concentration above the percolation threshold exhibited at least three-order change of its electrical resistance in a narrow interval of maximum 2% of deformation. The piezo-resistive sensitivity and the reproducibility of © Springer Science+Business Media, LLC 2011.
Original languageAmerican English
Pages (from-to)1794-1802
Number of pages9
JournalJournal of Materials Science
DOIs
StatePublished - 1 Feb 2012

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