One-Pot Preparation of Conducting Melamine/Polypyrrole/Magnetite Ferrosponge

Abstract

Polypyrrole was deposited in situ on the macroporous open-cell melamine sponge by the oxidation of pyrrole with iron(III) chloride. The oxidant was used in excess, and the reaction mixture after the polymerization thus contained both iron(II) and iron(III) chlorides. These subsequently provided magnetite after treatment with ammonia solution. The conducting melamine/polypyrrole produced in the first step thus afforded melamine/polypyrrole/magnetite ferrosponge in the second.The composite sponge was characterized with respect to molecular structure by FTIR spectroscopy.The dependence of conductivity on the sponge compression is provided and magnetic properties have also been determined. The performance of sponge in electromagnetic radiation shielding in GHz region is demonstrated. While conducting polypyrrole afforded the radiation reflection, magnetite added the absorption component.

Adsorption of organic dyes on macroporous melamine sponge incorporating conducting polypyrrole nanotubes

“…The FTIR spectra of sponge before and after dye adsorption have been analyzed as well as those of the individual components, melamine sponge and polypyrrole nanotubes (Figure 9). ATR FTIR spectrum of melamine is very close to the spectrum of polypyrrole nanotubes after deposition on melamine sponge 17 due to the similar bonding of nitrogen atoms (Figure 1). The maxima of the broad bands of melamine (spectrum M) are shifted from 1643 to 1528 cm −1 , from 1454 to 1438 cm −1 , and from 1325 to 1293 cm −1 after deposition of polypyrrole nanotubes (spectrum PPyNT/M), which corresponds to the maxima observed in the spectrum of polypyrrole powder (spectrum PPyNT).…”

“…Polypyrrole is a conducting polymer (Figure 1a) that has often been used for the surface modification of various organic and inorganic carrier materials to produce functional composites. The macroporous open‐cell melamine/formaldehyde sponge (Figure 2) coated with globular polypyrrole (Figure 3a) has recently been reported as an intermediate in the preparation of ferrosponge 17 . The study is extended here to the deposition of polypyrrole nanotubes (Figure 3b), along with accompanying polypyrrole globules (Figure 3c) or nanotubes (Figure 3d) produced outside the sponge.…”

“…Although polypyrrole and its composites have been tested for dye adsorption, 3,17 polypyrrole nanotubes have been investigated for this purpose only recently 18–20 . They were also used for the removal of inorganic pollutants, such as Cr(VI) ions 21,22 .…”

“…Polypyrrole of any morphology is produced as an intractable powder, and the deposition on suitable carriers affording the materials properties is required by the particular application. A commercial macroporous open‐cell melamine/formaldehyde sponge (Figure 1b) coated with polypyrrole nanotubes or nanotubes alone have already proved to be useful in diverse applications 17,18,23–25 . Having in mind especially the design of a potential dye adsorbent, the melamine sponge has been selected as a substrate for the deposition of polypyrrole nanotubes.…”

Self-healing Materials: A Review of Recent Developments

“…Ionic bonding is a common method of the design and preparation of self-healing materials, [98] such as in the design of self-healing hydrogels, [99][100][101] the self-healing ability of hydrogels can be obtained by the interaction of iron ions with reversible ions of Gelatin and iron ions with reversible ions of polypyrrole. [102,103] A gelatin-based hydrogel grafted on polypyrrole, which had conductivity, self-healing and injectable properties, was proposed by Wang. [104] By grafting methacrylic anhydrite onto gelatin, they produced doublebond-functional gelatin (GelMA), the common conductive polymer polypyrrole was then grafted onto gelatin (PPy-GelMA) by double bond reaction (Figs.…”