Search

Flexible films based on polypyrrole/silver (PPy/Ag) nanocomposites are fabricated through the reaction between polypyrrole nanotubes and silver ions and subsequent direct filtration. The microstructure and composition of the as-prepared nanocomposite films are investigated by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, and so on. The thermoelectric performances of the nanocomposite films with different silver contents are studied. Compared with pure polypyrrole (PPy) film, as the silver content in the nanocomposite increases, the electric conductivity of the nanocomposite film increases greatly while the Seeback coefficient decreases. Therefore, the power factor of the nanocomposite film is much higher than that of polypyrrole film. Moreover, there is no obvious change of thermoelectric performance of the polypyrrole/silver nanocomposite film after bending for 500 times. The results indicate that the film of polypyrrole/silver nanocomposites is promising as one kind of high-performance and flexible thermoelectric materials. [ABSTRACT FROM AUTHOR]

Three-dimensional polypyrrole/chitosan nanocomposite monoliths are fabricated by polymerization of pyrrole in chitosan aqueous solution. The static polymerization of pyrrole monomer and the cross-linking of chitosan by glutaraldehyde occur simultaneously, resulting in the self-assembly of polypyrrole/chitosan nanocomposite aerogel monolith. The addition of methyl orange and glutaraldehyde and the static reaction play key roles in the formation of the self-standing aerogel monolith. The as-prepared monolith with larger specific surface area exhibits much better adsorption capability for Cr(VI) removal in comparison with that prepared without the addition of glutaraldehyde. The adsorption process and adsorption isotherms are found to well follow the pseudo-second-order and Langmuir models, respectively. Furthermore, this polypyrrole/chitosan nanocomposite monolith is stable and recyclable. About 73.5% of the initial adsorption capability is kept after eight adsorption-desorption cycles. The polypyrrole/chitosan nanocomposite monolith can be a promising candidate for the efficient removal of Cr(VI). [ABSTRACT FROM AUTHOR]

The magnetic polypyrrole (PPy) composite nanofibers are prepared in a simple one‐pot method via in situ chemical polymerization of pyrrole in the presence of methyl orange, followed by the treatment of ammonia solution. The effect of methyl orange (MO) on the morphology of the magnetic PPy nanocomposites was investigated. The composite nanofibers were used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. Moreover, because of the magnetic Fe3O4 nanoparticles in the composites, it is easy for the composites to be separated from waste water by external magnet. These composites with hierarchical structures are expected to be a potential candidate for water treatment. POLYM. COMPOS., 39:1507–1513, 2018. © 2016 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

The hierarchical polypyrrole/sulfonated reduced graphene oxide nanocomposites were synthesized via water/organic liquid interfacial fabrication. Sulfonated reduced graphene oxide with negative charges acted as the dopant of polypyrrole during the process of interfacial fabrication, which efficiently prompted the incorporation of sulfonated reduced graphene oxide in the polypyrrole matrix through the interfacial interaction between polypyrrole and sulfonated reduced graphene oxide. The effect of organic liquid on the microstructure and supercapacitive performance of the nanocomposites was investigated. In the case of hexane as the organic liquid, a high specific capacity of 265.6 F g−1 at a current density of 1 A g−1 was obtained from the polypyrrole/sulfonated reduced graphene oxide nanocomposite, and about 90% of the initial capacity was retained after 1,000 cycles. The improved electrochemical capacitance of the nanocomposite was ascribed to the combinative properties of good electrical conductivities of two components and the unique structure with increased specific surface area. These nanocomposites could be promising electrode materials for high‐performance electrochemical capacitors. POLYM. COMPOS., 39:E378–E385, 2018. © 2017 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

An effective one-step strategy for the static assembly of hydrogels from polypyrrole (PPy) and graphene oxide (GO) is demonstrated. The static polymerization of pyrrole monomer was carried out in the presence of GO nanosheets, leading to the formation of PPy-GO hydrogels. During the static polymerization process, gelation takes place simultaneously by supramolecular interactions. The well-dispersed GO nanosheets in the polymer networks resulted in a significant improvement in water absorbencies. With only a very low loading of GO in the PPy-GO hydrogels, they exhibited significantly larger water uptake compared to a PPy hydrogel. Even in saline solutions, PPy-GO hydrogels also showed obvious water absorbency. Moreover, the PPy-GO hydrogels exhibited a better water retention ability compared with the control under the same conditions. This method is believed to provide possibilities to combine the extraordinary performances of GO with the multifunctional properties of conducting polymers, thus holding great potential for technical applications in the future. [ABSTRACT FROM AUTHOR]

The synthesis of polypyrrole (PPy)/AgCl nanocomposites with their size ranging around 70-100 nm are achieved by using magnetic ionic liquid as the oxidant in the interface polymerization system. The interface polymerization leads to the formation of uniform and unaggregated nanocomposites with a relatively narrow size distribution confined to submicrometer-sized domains. The morphology and structure of the nanocomposites are characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and X-ray diffraction (XRD). The potential application of PPy/AgCl nanocomposites as a H2O2 biosensor is also reported. Copyright © 2010 John Wiley & Sons, Ltd. Erratum: Magnetic ionic liquid-assisted synthesis of polypyrrole/AgCl nanocomposites [ABSTRACT FROM AUTHOR]

Abstract: Polpyrrole (PPy)/silver nanocomposites with their size of around 80–120nm were successfully synthesized at the interface of water and ionic liquid. High dispersed PPy/silver nanocomposites were obtained in the presence of polyvinylpyrrolidone (PVP) by controlling the reacting conditions. The morphology and structure of the resulting nanocomposites were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. It was also found that the electrical conductivity of PPy/silver nanocomposites was much higher than that of pure PPy. Cyclic voltammetric experiments further indicated that the nanocomposite had excellent redox ability: polypyrrole; silver; ionic liquid; interface synthesis; and nanocomposites. [Copyright &y& Elsevier]