Ion exchange, anisotropic structure and thermal stability of polypyrrole films

Truong, V. -T., Ennis, B. C. and Forsyth, M. 1995, Ion exchange, anisotropic structure and thermal stability of polypyrrole films, Synthetic metals, vol. 69, no. 1-3, pp. 479-480, doi: 10.1016/0379-6779(94)02534-6.

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Title Ion exchange, anisotropic structure and thermal stability of polypyrrole films
Author(s) Truong, V. -T.
Ennis, B. C.
Forsyth, M.ORCID iD for Forsyth, M.
Journal name Synthetic metals
Volume number 69
Issue number 1-3
Start page 479
End page 480
Publisher Elsevier S.A.
Place of publication Basel, Switzerland
Publication date 1995-03-01
ISSN 0379-6779
Summary The thermal stability of electrochemically prepared polypyrrole (PPy) films with p-toluene sulfonate (pTS) or perchlorate (CIOP4) counter ion (PPy/pTS and PPy/ClO4) is improved by simple treatment with aqueous sulfuric acid, sodium sulfate or sodium bisulfate. The degree of stabilization achieved depends on the solution, temperature and duration of treatment. PPy/pTS is easily stabilized and thick films (43μm) retain 90 % of the initial conductivity after long period (300 h) at 150 °C, while thinner films (12 μm) retain slightly less (70 %). A model for the conductivity decay has been proposed. Although the mechanism for improved stability is not yet clear it is apparent that the level of ion exchange and the original polymer microstructure are important. The early stages of ion exchange are not symmetrical and diffusion is facilitated at the electrode side of the film. Furthermore, X-ray diffraction shows no evidence of morphological change after treatment of thick PPy/pTS but in thin PPy/pTS and PPy/ClO4 films an additional peak is indicative of more ordered structure following treatment. These observation may imply that there is a higher density of crosslinks and branching at the growth side than at the electrode side of the film.
Language eng
DOI 10.1016/0379-6779(94)02534-6
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 ©1995, Elsevier Science S.A.
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