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Enhanced thermal properties and morphology of ion-exchanged polypyrrole films
journal contribution
posted on 1995-05-01, 00:00 authored by V T Truong, B Ennis, Maria ForsythMaria ForsythThe thermal stability of electrochemically prepared polypyrrole (PPy) films with p-toluenesulfonate (pTS) or perchlorate (ClO4−) counterion (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. 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. A model for the conductivity decay as a function of thickness has been proposed. 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 PPy/pTS (43 μm), but in PPy/pTS (12 μm) and PPy/ClO4− (41 μm) films an additional peak is indicative of more ordered structure following treatment. The glass transition temperature, Tg, of PPy/pTS and PPy/ClO4− films obtained by modulated differential scanning calorimetry is approximately 155°C.
History
Journal
PolymerVolume
36Issue
10Pagination
1933 - 1940Publisher
Elsevier Ltd.Location
Oxford, EnglandPublisher DOI
ISSN
0032-3861eISSN
1873-2291Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1995, Elsevier Science Ltd.Usage metrics
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