Electrical, Mechanical, and Thermal Analysis of Natural Rubber/Polyaniline-Dbsa Composite

Materials Research-Ibero-American Journal of Materials Volume: 17 Pages: 59-63 Published: 2014

UV-Vis-NIR spectra of PANI-DBSA and the NR/PANIDBSA composite.

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Writers: Michael J.da Silva, Aléx O.Sanches, Luiz F. Malmonge, José A. Malmonge

Keywords: natural rubber, polyaniline, electrical conductivity, percolation threshold

Abstract: A composite of natural rubber (NR) with polyaniline (PANI) was obtained by mixing an aqueous dispersion of dodecylbenzenesulfonic acid (DBSA)-doped PANI with NR latex in different concentrations. Films were obtained by the casting method and characterized by ultraviolet visible near-infrared (UV-Vis-NIR) spectroscopy, thermogravimetry/differential thermogravimetry (TG/DTG), stress-strain testing, differential scanning calorimetry (DSC), and DC electrical conductivity measurements. The UV-vis-NIR spectrum showed that PANI remained doped in the composite, and this improved the mechanical and electrical proprieties of NR films and afforded them good thermal stability up to ~200ºC. The percolation threshold did not follow the universal critical exponent, and in this case, conduction preferentially occurs by hopping and tunneling.

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