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

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), 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
OECD category: Polymer science
Impact factor: 4.000, year: 2021
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