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Mechanisms governing the enhanced thermal stability of acid and base treated polypyrrole Cheah, K., Forsyth, M., Truong, V. -T. and Olsson-Jacques, C. 1997, Mechanisms governing the enhanced thermal stability of acid and base treated polypyrrole, Synthetic metals, vol. 84, no. 1-3, pp. 829-830. Title Mechanisms governing the enhanced thermal stability of acid and base treated polypyrrole Author(s) Cheah, K. Forsyth, M. Truong, V. -T. Olsson-Jacques, C. Journal name Synthetic metals Volume number 84 Issue number 1-3 Start page 829 End page 830 Publisher Elsevier S.A. Place of publication Basel, Switzerland Publication date 1997-01 ISSN 0379-6779 Keyword(s) polypyrrole thermal Stability acid and Base Treatment x-ray photoelectron spectroscopy conductivity Summary One of the major problems associated with the use of polypyrrole (PPy) in a practical engineering application is its poor thermal stability at elevated temperatures, especially in the presence of oxygen and moisture. Several authors have shown that enhanced stability can be achieved through treatment with simple acids and bases. This paper presents a summary of the possible structural changes which occur as a result of these treatments and those that appear to be related to enhanced conductivity stability. A slight increase in conductivity (10–20%) is observed for acid treated PPy films which is found to be the result of protonation of the pyrrole structure. This effect is dramatically enhanced by treatment at high temperatures where an increase in conductivity of >84% can be achieved. Base treatment of the PPy films results in the deprotonation of the pyrrole structure leading to the loss of conductivity (>40%). Preliminary X-ray Photoelectron Spectroscopy (XPS) results indicate that both acid and base treatment resulted in the elimination of reactive sites for oxygen. Long term thermal ageing of these treated films were conducted at 150 °C in air. The conductivity decay behaviour was found to follow multiple first order chemical reaction kinetics. Language eng Field of Research 039999 Chemical Sciences not elsewhere classified Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences HERDC Research category C1.1 Refereed article in a scholarly journal Copyright notice ©1997, Elsevier Science S.A. Persistent URL http://hdl.handle.net/10536/DRO/DU:30030089 Document type: Journal Article Collection: Institute for Technology Research and Innovation Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 10 Sep 2010, 15:08:16 EST Thu, 23 Sep 2010, 11:40:37 EST Thu, 23 Sep 2010, 11:42:06 EST Filtered Full Citation counts:   Cited 20 times in TR Web of Science Cited 21 times in Scopus Search Google Scholar Access Statistics: 261 Abstract Views, 0 File Downloads  -  Detailed Statistics Created: Fri, 10 Sep 2010, 15:08:16 EST

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