Electrochemical synthesis of polypyrrole in powder form
| Autor: | E. V. Zolotukhina, Dmitry V. Konev, O. I. Istakova, Tatiana O. Medvedeva, Mikhail A. Vorotyntsev, Artem T. Glazkov |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science 02 engineering and technology Polymer Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Polypyrrole Electrochemistry 01 natural sciences 0104 chemical sciences Colloid chemistry.chemical_compound Monomer chemistry Polymerization Chemical engineering Electrode General Materials Science Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Solid State Electrochemistry. 23:251-258 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-018-4129-2 |
| Popis: | Novel approach to synthesis of conjugated oligomers/polymers is proposed. This approach combines all advantages of electrochemical methods: variation of the oxidation potential in wide range with high precision, direct control of the process rate and product yield, variation of both the doping anion/cation nature and the composition of polymerization medium, absence of chemical oxidative reagents in reaction mixture. Contrary to the conventional use of this synthetic method, it has been exploited in our study for generation of polymeric products outside the electrode surface. This goal has been implemented via oxidation of the monomer at porous electrode with simultaneous pumping of the polymerization medium (monomer in background electrolyte solution) through porous electrode with a certain rate. It leads to electrochemical generation of active intermediates (cation radicals) at the electrode surface with their recombination and subsequent accumulation of the products not only as film on the electrode surface but also as a colloid in solution outside the porous medium. Since this reaction path toward bulk solution products should evidently be favored by slow steps in the course of the polymer formation, this approach has been tested for pyrrole oxidation (both in its pure monomer solution and in the presence of the bromide redox mediator) since this monomer is known of its high rate of polymer chain formation. |
| Databáze: | OpenAIRE |
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