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Conducting polypyrrole and polypyrrole/manganese dioxide composites prepared with a solid sacrificial oxidant of pyrrole

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    0542357 - ÚMCH 2022 RIV CH eng J - Journal Article
    Sapurina, I. - Bubulinca, C. - Trchová, M. - Prokeš, J. - Stejskal, Jaroslav
    Conducting polypyrrole and polypyrrole/manganese dioxide composites prepared with a solid sacrificial oxidant of pyrrole.
    Synthetic Metals. Roč. 278, August (2021), s. 1-7, č. článku 116807. ISSN 0379-6779. E-ISSN 0379-6779
    R&D Projects: GA ČR(CZ) GA19-04859S
    Institutional support: RVO:61389013
    Keywords : conducting polymer * polypyrrole * manganese dioxide
    Subject RIV: CD - Macromolecular Chemistry
    OBOR OECD: Polymer science
    Impact factor: 3.266, year: 2020
    Method of publishing: Limited access
    https://www.sciencedirect.com/science/article/pii/S0379677921001120?via%3Dihub

    Polypyrrole was prepared by the oxidation of pyrrole with solid manganese dioxide. The present study concerns the chemistry of this process rather than materials properties of the products. The oxidant alone is insoluble in aqueous medium but the reductive dissolution takes place in the presence of pyrrole. Polypyrrole is the exclusive product below the stoichiometric mole ratio [MnO2]/[pyrrole] = 1.25, and polypyrrole/manganese dioxide composites result at higher ratios. Unlike with iron(III) chloride where protons are generated during the oxidation of pyrrole, with manganese dioxide they are consumed and water is a by-product. The sufficient acidity of the reaction medium is thus needed in order to obtain conducting materials. The presence of organic dyes in the preparation of polypyrrole improved the conductivity. One-dimensional morphology of polypyrrole was observed when methyl orange was introduced to the reaction mixture.
    Permanent Link: http://hdl.handle.net/11104/0320010

     
     
Number of the records: 1