Thermochromism in Optically Active Polyaniline Salts

Optically active polyaniline salts PAn.(+)-HCSA (HCSA = 10-camphorsulfonic acid) have been shown to have different conformations for their polyaniline chains depending on whether they are synthesized chemically or electrochemically. These conformations are assigned as “compact coil” and partial “exp...

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Bibliographic Details
Published in:Macromolecules 1998-09, Vol.31 (19), p.6529-6533
Main Authors: Norris, Ian D, Kane-Maguire, Leon A. P, Wallace, Gordon G
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:Optically active polyaniline salts PAn.(+)-HCSA (HCSA = 10-camphorsulfonic acid) have been shown to have different conformations for their polyaniline chains depending on whether they are synthesized chemically or electrochemically. These conformations are assigned as “compact coil” and partial “expanded coil”, respectively. An “expanded” to “compact” coil transformation is induced by heating to 140 °C for 10 min, as evidenced by UV−visible and circular dichroism spectral studies. At temperatures greater than 180 °C, progressive dedoping of the PAn.(+)-HCSA salt films occurs, with the formation of racemic emeraldine base.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma971832t