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- Title
Polypyrrole-Coated Melamine Sponge as a Precursor for Conducting Macroporous Nitrogen-Containing Carbons.
- Authors
Stejskal, Jaroslav; Vilčáková, Jarmila; Jurča, Marek; Fei, Haojie; Trchová, Miroslava; Kolská, Zdeňka; Prokeš, Jan; Křivka, Ivo
- Abstract
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.
- Subjects
MELAMINE; CONDUCTING polymers; MOLECULAR structure; POLYPYRROLE; ELECTROMAGNETIC radiation; RADIATION absorption; MACROPOROUS polymers
- Publication
Coatings (2079-6412), 2022, Vol 12, Issue 3, p324
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings12030324