Journal
SYNTHETIC METALS
Volume 162, Issue 7-8, Pages 555-562Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2012.02.011
Keywords
Epoxy; Polyaniline; Clay; Morphology; Electrical properties
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Electrically conductive composites based on epoxy resin, anhydride hardener and polyaniline (PANI) as conductive filler have been formulated and characterized. Standard PANI (Pani) and PANI/clay (PANICN) nanofillers were used to study the impact of filler morphology on the electrical properties of composites. Clay was used as a nanostructured template to increase the PANI aspect ratio (ratio of length to diameter or thickness). The use of PANICN reduces the electrical percolation threshold of composites from 4.5 vol.% to 1.3 vol.%. Moreover, the conductivity of composites containing PANICN is improved to values superior to 10(-3) S/cm. The effects of reagents and curing conditions were also evaluated. It was demonstrated that a classical alkaline curing accelerator, such as imidazole, exhibits chemical incompatibilities with the PANI conductive form, resulting in less conductive composites. Substituting the classical alkaline curing accelerator with a cationic accelerator, such as a Lewis acid, is a promising alternative to obtain conductive epoxy composites with a low content of PANI. (C) 2012 Elsevier B.V. All rights reserved.
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