On the nature of influence of polyelectrolyte molecular weight on aniline electropolymerizationстатья
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Дата последнего поиска статьи во внешних источниках: 20 декабря 2017 г.
Аннотация:Electrodeposition of polyaniline (PANI) complexes
with a polymeric sulfonic acid of variable molecular
weight has been studied with the purpose to
explain specific features of aniline electropolymerization
in the presence of polyelectrolytes. Poly-(2-acrylamido-
2-methyl-1-propanesulfonic acid) (PAMPSA) was taken
as a model polyelectrolyte due to the ease of varying its
molecular weight during polymerization of the monomer.
Depending on the polyacid molecular weight, crucial
changes in the shape of charge– and potential–time
dependences and cyclic voltammograms have been observed
during potentiostatic, galvanostatic, and cyclic
voltammetry syntheses of PANI, respectively. The results
are considered in terms of the influence of molecular
weight on proton condensation ability of the
polyacid and, therefore, on the degree of aniline protonation
and its local concentration in the vicinity of
polyacid macromolecule. The PANI films obtained are
characterized by cyclic voltammetry and UV–vis and
Raman spectroelectrochemistry, and the influence of
the polyacid molecular weight on these properties is
discussed.