Polypyrrole-Coated Melamine Sponge as a Precursor for Conducting Macroporous Nitrogen-Containing Carbons

Coatings

Miroslava Trchová¹  Haojie Fei²  Marek Jurča²  Jarmila Vilčáková²  Jan Prokeš³  Ivo Křivka³  Zdeňka Kolská⁴  Jaroslav Stejskal⁵ 

[1] Central Laboratories, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic;Centre of Polymer Systems, Tomas Bata University in Zlin, 760 01 Zlin, Czech Republic;Faculty of Mathematics and Physics, Charles University, 180 00 Prague 8, Czech Republic;Faculty of Science, J. E. Purkyně University, 400 96 Ústí nad Labem, Czech Republic;Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic;

关键词: conducting polymer;    polypyrrole;    carbonization;    nitrogen-containing carbon;    macroporous conducting sponge;   

DOI  :  10.3390/coatings12030324

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown