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 ~200°C. The percolation threshold did not follow the universal critical exponent, and in this case, conduction preferentially occurs by hopping and tunneling.
Highlights
Among currently available intrinsically conducting polymers (ICP), polyaniline (PANI) has emerged as one of the most promising ones for technological applications owing to its good electrical properties, environmental stability, low production cost, and ease of synthesis[1,2]
Three bands are observed in the PANI-dodecylbenzenesulfonic acid (DBSA) spectrum, indicating that the polymer is in its emeraldine salt form
The same bands are observed in the UV-VIS-NIR spectra of natural rubber (NR)/PANI-DBSA composites, indicating that the high pH of natural latex did not lead to the dedoping of PANI
Summary
Among currently available intrinsically conducting polymers (ICP), polyaniline (PANI) has emerged as one of the most promising ones for technological applications owing to its good electrical properties, environmental stability, low production cost, and ease of synthesis[1,2]. PANI’s applications are limited by its poor infusibility, low solubility in organic solvents, and poor mechanical properties[2]. PANI’s mechanical properties can be improved by mixing it with a polymeric host matrix to form composites or blends[3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]. Natural rubber (NR) has been increasingly used for forming composites owing to its unique mechanical properties. NR is extensively used in various products that require superior properties such as elasticity, flexibility, and resilience
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