Some aspects of polyaniline template synthesis within and on the surface of perfluorinated cation exchange membrane

[Display omitted] •Polyaniline content in composite obtained by template synthesis is around 2 % by wt.•Oxidant diffusion from solution limits polyaniline synthesis at low concentrations.•Monomer diffusion to interface plays key role at high oxidant concentrations.•Polymerization proceeds near the m...

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Bibliographic Details
Published in:Synthetic metals 2020-03, Vol.261, p.116292, Article 116292
Main Authors: Loza, Natalia V., Falina, Irina V., Kononenko, Natalia A., Kudashova, Daria S.
Format: Article
Language:English
Subjects:
Aniline
Cation exchanging
Chemical polymerization
Constraining
Kinetics
Membranes
Modification
Monomers
Nafion-type membrane
Oxidizing agents
Polyaniline
Polyanilines
Polymerization
Reaction kinetics
Sorption
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Summary:[Display omitted] •Polyaniline content in composite obtained by template synthesis is around 2 % by wt.•Oxidant diffusion from solution limits polyaniline synthesis at low concentrations.•Monomer diffusion to interface plays key role at high oxidant concentrations.•Polymerization proceeds near the membrane surface if oxidant is co-ion.•Polymerization reaction rate is higher if oxidant is counter-ion than for co-ion. Detailed investigation has been made into the peculiarities of monomer sorption and desorption at different stages of aniline oxidative polymerization inside the perfluorinated membrane during preparation of composites with absorbance lower than 3 abs. units. The evaluation of the membrane saturation degree by monomer at every synthesis stage is performed, the mass fraction of the polyaniline in the composite membrane is estimated. The investigation into the kinetics of polyaniline synthesis with cationic and anionic oxidants in the membrane matrix has shown that the oxidant nature affects the polymerization rate and permitted to discover the limiting stage of the polymerization reaction. The limiting stage of polyaniline synthesis inside the membrane matrix is identified. The conditions to cease the polymerization reaction using oxidants of different nature are revealed. The opportunity to control the distribution of the modifier in the composite by choosing the appropriate oxidant is shown.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2020.116292