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, doi: 10.1016/S0379-6779(96)04167-7.

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Title Mechanisms governing the enhanced thermal stability of acid and base treated polypyrrole
Author(s) Cheah, K.
Forsyth, M.ORCID iD for 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
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
DOI 10.1016/S0379-6779(96)04167-7
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.
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