Thermal, Mechanical and Electrical Investigation of Elastomer-Carbon Black Nanocomposite Piezoresistivity
Polymeric composites, where polymeric matrices are purposefully added with suitable fillers, have raised the interest of the scientific community, since materials with characteristics that depend on the nature of both the polymeric matrix and the filler can be obtained. The paper deals with the investigation of composites based on an insulating polymeric matrix, realized by using polydimethylsiloxane (PDMS) and carbon black (CB), as the filler, for realizing nanocomposites. The PDMS is an insulating matter, while the CB has conducting properties. If a suitable concentration of the CB is used, it is possible, therefore, changing the electrical properties of the composite from insulating to conducting. Such a possibility is, e.g. described in the framework of the percolation theory. Since a deformation of the composite causes a corresponding change in the concentration of the filler, it is possible using the described nanocomposites as piezoresistive elements. Based on the considerations reported above, composites were realized by using different concentrations of the filler, in order to obtain a reasonable value of the composite resistivity. The corresponding thermal, mechanical and electrical properties where, therefore, investigated in typical laboratory conditions.
KeywordsPolydimethylsiloxane (PDMS) Carbon black (CB) Viscoelasticity Piezoresistivity
Thi paper is partially supported by the University of Catania Project FIR2014 “Realizzazione di sensori piezoresitivi mediante nano compositi a matrice elastometica”.
- 1.De Luca, V., Digiamberardino, P., Di Pasquale, G., Graziani, S., Pollicino, A., Umana, E., Xibilia, M.G.: Ionic electroactive polymer metal composites: Fabricating, modeling, and applications of postsilicon smart devices. J. Polym. Sci., Part B: Polym. Phys. 51(9), 699–734 (2013)CrossRefGoogle Scholar
- 3.Pandey, S., Goswami, G.K., Nanda, K.K.: Nanocomposite based flexible ultrasensitive resistive gas sensor for chemical reactions studies. Sci. Rep. 3, art. no. 2082 (2013)Google Scholar
- 5.Giannone, P., Graziani, S.: Flexible tailored sensors for large deformation monitoring. In: Proceedings of I2MTC 2009—International Instrumentation and Measurement Technology Conference, Singapore, Singapore, pp. 593–596 (2009)Google Scholar
- 6.Giannone, P., Graziani, S., Umana, E.: Investigation of carbon black loaded natural rubber piezoresistivity. In: Proceedings of I2MTC 2015—International Instrumentation and Measurement Technology Conference, Pisa, Italy, pp. 1477–1481 (2015)Google Scholar