Publication: Extruded polyaniline/EVA blends: Enhancing electrical conductivity using gallate compatibilizers
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2014-02-14
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Abstract
The role played by alkyl gallate compatibilizers to enhance the conductivity of extruded polyaniline (PANI)–polyethylene-co-vinyl-acetate (EVA) composites was investigated. PANI doped with dodecylbenzensulfonic acid (DBSA) with 2 S cm−1 conductivity was synthetized via emulsion pathway. The achievement of doped emeraldine salt was confirmed by infrared and X-ray photoelectron spectroscopy.
Two gallic acid compatibilizers, namely octyl gallate (OG) and lauryl gallate (LG) were studied by adding increasing amounts (0–20%) to the composite. Gallate compatibilizers enhanced the conductivity of the blend by one order of magnitude, achieving values similar to the pure polyaniline (1–2 S cm−1) using only 30% of PANI. Infrared spectral changes proved the formation of intermolecular hydrogen bonds between EVA and gallate esters and suggested additional interactions with PANI. These interactions improved the adhesion between PANI and EVA, thus explaining the better dispersion of the PANI observed by SEM and the increase in rheological viscosity and shear rate measurements.
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Supplementary data associated with this article can be found,
in the online version, at http://dx.doi.org/10.1016/j.synthmet.
2014.01.009.
Received 2 October 2013; received in revised form 17 December 2013; accepted 14 January 2014; available online 6 February 2014
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