Search

Poly(N-methylpyrrole) nanotubes were facilely fabricated by in situ chemical polymerization via a reactive template of MnO2 and were developed as electrode materials for the detection of dopamine. The microstructure, morphology, and chemical composition of the as-prepared poly(N-methylpyrrole) nanotubes have been investigated by X-ray powder diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Furthermore, a glassy carbon electrode (GCE) was modified with poly(N-methylpyrrole) nanotubes and showed sensitive catalytic activity for electrochemical detection of low concentration of dopamine even in the presence of and ascorbic acid. [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]

In the present work, by using the in situ polymerization of aniline in acidic aqueous solution of PVA and freezing-thawing method, the reinforced conducting polymer hydrogel of polyaniline/polyvinyl alcohol (PANI/PVA) was prepared and directly used as the self-supported electrode for supercapacitor. The chemical structure of PANI/PVA hydrogel was characterized by UV-Vis, and the three-dimensional (3D) interconnected hierarchical nanoporous structure was observed by scanning electron microscopy. The measurement of compressive strength demonstrated the high mechanical strength of the hydrogel. The electrochemical properties of PANI/PVA hydrogel electrodes were evaluated by using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge, which indicated their good responsiveness and rate capability, low resistance, high specific capacitance (240 F/g at current density of 1 A/g) and excellent cycling stability. The easily fabricated PANI/PVA hydrogel combined hierarchical nanoporous microstructure, self-supported feature and favorable capacitive behavior and provided a new strategy for constructing high-performance electrode for supercapacitors. [ABSTRACT FROM AUTHOR]

Unique polypyrrole (PPy) hydrogels are prepared by using orange IV as the dopant and FeCl as the oxidant. The static polymerization of pyrrole monomer in aqueous solution is accompanied with self-assembly of PPy hydrogel. PPy hydrogels not only show good electrical conductivities, but also exhibit excellent water-absorbent behaviors. The macroscopic appearance, microscopic morphology and water-absorbent behaviors of PPy hydrogels can be controlled by the choice of the reaction condition. The effects of ionic strength on the physical properties of PPy hydrogels are also studied. The results indicate that PPy hydrogels show improved water absorbencies in saline solution. Moreover, PPy hydrogel is used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. PPy hydrogel exhibits much better adsorption performance than common PPy nanoparticles. This kind of PPy hydrogel is expected to be a potential candidate for water treatment. [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]

Polyaniline–palladium (PANi-Pd) composite microflakes were synthesized through an immiscible organic/inorganic biphasic system in the presence of poly(ethylene glycol) with molecular weight 4,000 (PEG4000). Aniline was oxidized by PdCl2 in the interface polymerization system, yielding PANi microflakes and elemental Pd nanoparticles simultaneously. Palladium nanoparticles were uniformly dispersed in the microflakes of PANi. The results of FTIR spectra suggested that the oxidation degree of PANi was affected by the initial ratio of metal ions to monomer. The PANi-Pd composites were characterized using X-ray photoelectron spectroscopy and the conductivity of the composite was measured by conventional four-probe method. Scanning and transmission electron microscopy were used to show the morphology of the composites. [ABSTRACT FROM AUTHOR]

A simple one-step method for the chloromethylation of polyimide (PI) under mild conditions was used to introduce benzyl chloride groups into PI film surface. Covalently tethered hydrophilic polymer brushes of poly(ethylene glycol) monomethacrylate (PEGMA) and glycidyl methacrylate (GMA) were prepared via surface initiated atom-transfer radical polymerization (ATRP) from the chloromethylated PI surfaces using benzyl chloride groups as the active ATRP initiators. A kinetics study indicated that the chain growth from the films was in agreement with a controlled process. The dormant chain ends of the grafted polymer on the PI films could reinitiate the consecutive surface-initiated ATRP to prepare surface-functionalized diblock copolymer brushes on the PI films. The modified surface was characterized by X-ray photoelectron spectroscopy (XPS) after each modification stage. Protein adsorption experiments indicated that the PI-P(PEGMA) membrane exhibited substantially improved anti-fouling properties compared to the pristine PI surface. [ABSTRACT FROM AUTHOR]

The hierarchical reduced graphene oxide/SnO 2 /polypyrrole ternary composites are prepared in a one-pot method via in situ redox reaction between graphene oxide and Sn 2+ ions, followed by the polymerization of pyrrole monomers in the presence of methyl orange. The ternary composites are composed of one-dimensional polyprrole nanofibers and SnO 2 nanoparticles distributed in the network of graphene nanosheets. Supercapacitors based on the hierarchical composite show larger specific capacitance compared with the ternary composite prepared without methyl orange and reduced graphene oxide/SnO 2 binary composite. They also exhibit superior electrochemical rate capability and cyclic stability. The capacitance retained about 95% after 800 galvanostatic cycles at 1 A/g. The high electrochemical performance results from the hierarchical nanostructure, the efficient combination of components and the synergistic interaction among the three components. The hierarchical ternary composites are promising electrode material for high-performance supercapacitors. [ABSTRACT FROM AUTHOR]

Abstract: Surface modification of polyimide (PI) films were first carried out by chloromethylation under mild conditions, followed by surface-initiated atom-transfer radical polymerization (ATRP) of 4-vinylpyridine (4VP) from the chloromethylated PI surfaces. The composition and topography of the PI surfaces modified by poly(4-vinylpyridine) (P4VP) were characterized by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM), respectively. The P4VP brushes with well-preserved pyridine groups on the PI surface was used not only as the chemisorption sites for the palladium complexes without prior sensitization by SnCl2 solution during the electroless plating of copper, but also as an adhesion promotion layer to enhance the adhesion of the electrolessly deposited copper to the PI surfaces. The T-peel adhesion strength of the electrolessly deposited copper on the modified PI surface could reach about 6.6N/cm. Effects of the polymerization time and the activation time in the PdCl2 solution on the T-peel adhesion strength of the electrolessly deposited copper in the Sn-free process to the modified PI surface were also studied. [Copyright &y& Elsevier]