Solution-state carbon-13 nuclear magnetic resonance studies of polyaniline

Solution-state 13C nuclear magnetic resonance spectra are presented for the emeraldine base and leucoemeraldine base forms of polyaniline. The bulk of the leucoemeraldine base sample gives a simple two-line spectrum, which is readily assignable. The emeraldine base samples give spectra of much great...

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Bibliographic Details
Published in:Polymer (Guilford) 1992, Vol.33 (20), p.4292-4298
Main Authors: Kenwright, A.M, Feast, W.J, Adams, P, Milton, A.J, Monkman, A.P, Say, B.J
Format: Article
Language:English
Subjects:
13C nuclear magnetic resonance
Applied sciences
conducting polymers
conformations
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
polyaniline
Properties and characterization
Solution and gel properties
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Summary:Solution-state 13C nuclear magnetic resonance spectra are presented for the emeraldine base and leucoemeraldine base forms of polyaniline. The bulk of the leucoemeraldine base sample gives a simple two-line spectrum, which is readily assignable. The emeraldine base samples give spectra of much greater complexity, showing many more lines than there are carbons in the postulated chain repeat unit. This is rationalized in terms of slow interchange of the many conformers available to the emeraldine base form. A quantitative ‘region assignment’ is made. Gel permeation chromatography measurements show that interconversion between the two forms is achieved without either significant crosslinking or chain scission. The minor peaks in the spectrum of the leucoemeraldine base form due to chain defects (including chain ends) are compared with chemical shift values calculated for postulated structures, and some structures can be rejected on the basis of this.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(92)90270-7