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Investigation of the aggregation phenomenon of polyaniline in dilute solutions

✍ Scribed by Yun-Hsin Liao; Ti Kang Kwei; Kalle Levon

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
446 KB
Volume
196
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Aggregation of polyaniline chains in dilute solutions was observed in N‐methyl‐2‐pyrrolidone by light scattering, gel permeation chromatography, and viscosity measurements. The aggregation resulted in a negative second virial coefficient in light scattering measurements and concave reduced viscosity curves. The driving force for aggregation is assumed to be a combination of hydrogen bounding between the imine and amine groups and the rigidity of backbone, and the aggregation was modeled to occur via side‐on packing of wormlike chains. Polyelectrolyte‐like viscosity behavior was also observed when a small amount of salt was added and the electrostatic interaction in polyelectrolyte polymer based on the Odijk theory was used to explain the role of the salt.

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