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Polypyrrole-coated melamine sponge as a precursor for conducting macroporous nitrogen-containing carbons
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SYSNO ASEP 0554694 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Polypyrrole-coated melamine sponge as a precursor for conducting macroporous nitrogen-containing carbons Author(s) Stejskal, Jaroslav (UMCH-V) RID, ORCID, SAI
Vilčáková, J. (CZ)
Jurča, M. (CZ)
Fei, H. (CZ)
Trchová, M. (CZ)
Kolská, Z. (CZ)
Prokeš, J. (CZ)
Křivka, I. (CZ)Article number 324 Source Title Coatings. - : MDPI
Roč. 12, č. 3 (2022)Number of pages 17 s. Language eng - English Country CH - Switzerland Keywords conducting polymer ; polypyrrole ; carbonization Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000776966200001 EID SCOPUS 85125783629 DOI 10.3390/coatings12030324 Annotation Macroporous open-cell melamine sponges were coated with a conducting polymer, polypyrrole, during in-situ oxidative polymerization of pyrrole. Two samples, differing in polypyrrole content, 8.2 and 27.4 wt%, were prepared. They were exposed to various temperatures up to 700 °C in an inert atmosphere. The macroporous structure and mechanical integrity were preserved after this process. This converted both the polypyrrole coating and the melamine sponge to macroporous nitrogen-containing carbons. The changes in molecular structure in the course of carbonization were followed by elemental analysis and FTIR and Raman spectra. The specific surface area of polypyrrole-coated sponge increased from ca. 90 to ca. 300 m2 g−1 along with accompanying increase in the porosity. The conductivity of the sponges was recorded as a function of compression in a newly developed apparatus. The sponge containing 27.4 wt% pyrrole had conductivity of the order of 10−2 S·cm−1 at 0.1 MPa pressure, which was reduced by four orders of magnitude when exposed to 400–500 °C and nearly recovered after the temperature reached 700 °C. The sponges were tested in electromagnetic radiation shielding and displayed both radiation absorption and, to a lower extent, radiation reflection proportional mainly to the samples’ conductivity. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2023 Electronic address https://www.mdpi.com/2079-6412/12/3/324
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