Aggregation in the nondoped polyaniline, emeraldine base (EB), as
observed by GPC in a
N-methyl-2-pyrrolidinone (NMP) solution, was found to be
closely related to the fraction of the imine
nitrogen atoms in the nondoped polymer, i.e., to the oxidation state of
the polymer. As EB was reduced
to leucoemeraldine base (LEB), the degree of aggregation was
significantly reduced. The results of gel
permeation chromatography (GPC) and infrared studies suggest that the
aggregation of the polymer is
due to interchain hydrogen bonding between the imine and
amine nitrogen sites on adjacent polymer
molecules. The degree of hydrogen bonding and, thus, aggregation
found in the polymer is greatly affected
by solvents, LiCl, and the oxidation state of the polymer.
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