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

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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 response suggested the possibility to use this material as a transducer in an electromechanical device.

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Acknowledgements

T. del Castillo Castro thanks the financial support from the “Programa de Apoyo Complementario para la Consolidación Institucional de Grupos de Investigación” of “Consejo Nacional de Ciencia y Tecnología”, Mexico. The authors also wish to thank Silva Burruel and Silvia Andrade for the SEM images.

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Authors and Affiliations

  1. Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, CP 83000, Hermosillo, Sonora, Mexico

    T. del Castillo-Castro, M. M. Castillo-Ortega & J. C. Encinas

  2. Universidad Marista, Periférico Norte, Tablaje 13941, Carretera Mérida-Progreso, CP 97300, Mérida, Yucatán, Mexico

    P. J. Herrera Franco

  3. Unidad de Materiales, Centro de Investigación Científica de Yucatán, Calle 43, 130 Colonia Chuburná de Hidalgo, CP 97200, Mérida, Yucatán, Mexico

    H. J. Carrillo-Escalante

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  1. T. del Castillo-Castro
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  2. M. M. Castillo-Ortega
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  3. J. C. Encinas
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  4. P. J. Herrera Franco
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  5. H. J. Carrillo-Escalante
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Correspondence to T. del Castillo-Castro.

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del Castillo-Castro, T., Castillo-Ortega, M.M., Encinas, J.C. et al. Piezo-resistance effect in composite based on cross-linked polydimethylsiloxane and polyaniline: potential pressure sensor application. J Mater Sci 47, 1794–1802 (2012). https://doi.org/10.1007/s10853-011-5965-y

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  • DOI: https://doi.org/10.1007/s10853-011-5965-y

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