Polyaniline–transition metal salt complexes: insight into formation mechanisms

Two basic morphologies of emeraldine base of polyaniline–transition metal salt complex films cast from N-methylpyrrolidinone solutions are described. The first morphology consists of grains and the other consists of loose aggregates, respectively. The correlation of the film morphology with formatio...

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Bibliographic Details
Published in:Synthetic metals 2005-03, Vol.149 (2), p.187-192
Main Authors: Dimitriev, O.P., Smertenko, P.S., Stiller, B., Brehmer, L.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Morphology
Organic polymers
Physicochemistry of polymers
Polyaniline
Properties and characterization
Solvation
Structure, morphology and analysis
Transition metal salt
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Summary:Two basic morphologies of emeraldine base of polyaniline–transition metal salt complex films cast from N-methylpyrrolidinone solutions are described. The first morphology consists of grains and the other consists of loose aggregates, respectively. The correlation of the film morphology with formation of precipitate in the complex solution, kinetics of solvent evaporation from the cast film, amount of solvent entrapped in the film, film conductivity, and IR absorption spectra is shown. Two different mechanisms of the complex formation as a result of competition in the polymer–inorganic salt–solvent trio interactions are discussed; the first mechanism results in folding of macromolecules into compact coils being then a core of grains in the complex films, and the second mechanism leads to blending of the polymer chains with solvent giving rise to formation of loose aggregates.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2004.12.007