Journal
POLYMER DEGRADATION AND STABILITY
Volume 95, Issue 12, Pages 2574-2583Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2010.07.028
Keywords
Conducting fabrics; Polypyrrole; Anthraquinone sulfonic acid; X-ray photoelectron spectroscopy; Scanning electrochemical microscopy
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Funding
- Spanish Ministerio de Ciencia y Tecnologia
- European Union [CTM2007-66570-C02-02]
- Universidad Politecnica de Valencia [PAID-05-08]
- Conselleria d'Educacio (Generalitat Valenciana)
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The stability of conducting fabrics of polyester (PES) covered with polypyrrole/anthraquinone sulfonic acid (AQSA) has been tested in different pH solutions (1, 7, 13) and after washing tests. It is important to determine the stability of the counter-ion in the polymer matrix, since its loss causes the decrease of the conducting properties of the fabrics. X-ray photoelectron spectroscopy (XPS) studies were done to quantify the amount of counter-ion in the polymer and to obtain the doping level (N delta+/N). Surface resistivity changes after the different tests were measured by electrochemical impedance spectroscopy (EIS). An increase in the solution pH caused a decrease of the doping level (N delta+/N), the release of part of the counter-ions and an increase in the surface resistivity. Cyclic voltammetry (CV) measurements showed a gradual loss of electroactivity as pH increased. The influence of the scan rate on the characterization of conducting fabrics has been also demonstrated by CV. Lower scan rates produce a more characteristic response than higher ones. Scanning electrochemical microscopy (SECM) measurements showed a loss of electroactivity when the sample was tested in the pH 13 solution, although the material continued being electroactive. (C) 2010 Elsevier Ltd. All rights reserved.
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