Electrochemical polymerization of aniline inside ordered macroporous carbonElectronic supplementary information (ESI) available: Cyclic voltammograms of the 677 nm macroporous carbon and the corresponding composite, infrared spectrum of PANI, SEM images of 490 nm and high magnification SEM images of 677 nm composite materials. See http://www.rsc.org/suppdata/cc/b1/b111727k/

2002 ◽  
pp. 676-677 ◽  
Author(s):  
Zhibin Lei ◽  
Hanchang Zhang ◽  
Shaohong Ma ◽  
Yanxiong Ke ◽  
Jianmin Li ◽  
...  
Keyword(s):  
Composite Materials ◽  
Infrared Spectrum ◽  
Electrochemical Polymerization ◽  
Supplementary Information ◽  
Cyclic Voltammograms ◽  
High Magnification ◽  
Sem Images ◽  
Ordered Macroporous ◽  
Macroporous Carbon

Polyaniline: Influence of Polymerization Current Density

1994 ◽  
Vol 369 ◽  
Author(s):  
Steen Skaarup ◽  
L.M.W.K. Gunaratne ◽  
Keld West ◽  
Birgit Zachau-Christiansen
Keyword(s):  
Cyclic Voltammetry ◽  
Current Density ◽  
High Current Density ◽  
Electrochemical Polymerization ◽  
Regular Structure ◽  
Spectral Lines ◽  
Complex Nature ◽  
Cyclic Voltammograms ◽  
Layer By Layer ◽  
Current Densities

AbstractPolyaniline has been synthesized in propylene carbonate by galvanostatic electrochemical polymerization at current densities between 16 and 1000 μA/cm2. Earlier results for polypyrrole have shown that low and high current density films have different properties: The films synthesized at low current density have a higher conjugation length and a more regular structure. The corresponding effect in PANI has been investigated by cyclic voltammetry and UV/visible spectroscopy. Simultaneous measurement of cyclic voltammograms and the absorbtion of selected spectral lines is used because of the complex nature of the PANI system which involves several redox systems as well as forms differing in the degree of protonation and morphology.The main result is that the method of galvanostatic synthesis at low current densities (-16 μA/cm2) produces polyaniline polymers of different, more conjugated and more regular structure than those prepared at higher current densities. The standard method of in situ layer-by-layer polymerization of conducting polymers during cyclic voltammetry often results in uncontrolled and unmeasured current densities of 0.5-2 mA/cm2 which produces a film that probably has a less regular structure containing more deviations from ideality.

scholarly journals Improvement of mechanical, thermal and morphostructural properties of SBS thermoplastic elastomer using kaolin and dolomite microparticles with modified surface

2020 ◽  
Author(s):  
Maria Sonmez ◽  
Mircea Juganaru ◽  
Anton Ficai ◽  
Ovidiu Oprea ◽  
Roxana Trusca ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Thermoplastic Elastomer ◽  
Elemental Distribution ◽  
Sem Images ◽  
Strong Stabilization ◽  
Modified Surface ◽  
Styrene Butadiene ◽  
Dsc Curves ◽  
Thermoplastic Rubber

The aim of this paper was to assess the influence of the modification of the surface of dolomite and kaolin with SiO2 and TiO2 precursors, on the block copolymer styrene-butadiene-styrene (SBS) type thermoplastic rubber properties. These composite materials were obtained by compounding SBS with various ratio of powders. Based on the SEM images it can conclude that the powders were homogenously dispersed in to the SBS matrix. The dolomite particles can be clearly identified in the SEM images as particles of 10 micrometers. The samples obtained with modified dolomite have similar morphology. The EDS elemental distribution confirming a good corroboration between the elements of the dolomite, kaolin and titanium or silicon elements. Based on the thermal analysis according to the residual mass, the presence of 20% mineral phase can be confirmed. According to the DSC curves a strong stabilization of the composite appears, because of the presence of the mineral component. According to the physical-mechanical data all the composite materials exhibit improved mechanical properties. Additionally, the modification of the kaolin and/or dolomite bring important improvements in mechanical properties. The samples 13 and 14 exhibit high tensile and tear strength. These composites can be used for various applications, such as, for instance, soles for firefighters' footwear.

scholarly journals Electrochemical synthesis of poly(2-methyl aniline): electrochemical and spectroscopic characterization

2001 ◽  
Vol 66 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Aleksandra Buzarovska ◽  
Irena Arsova ◽  
Ljubomir Arsov
Keyword(s):  
Raman Spectroscopy ◽  
Cyclic Voltammetry ◽  
Redox Reactions ◽  
Electrochemical Polymerization ◽  
Spectroscopic Characterization ◽  
Potential Range ◽  
Cyclic Voltammograms ◽  
Impedance Measurements ◽  
Order Of Magnitude ◽  
Poly Aniline

Poly(2-methyl aniline) or poly(ortho-toluidine), as ring substituted derivative of aniline, has been synthesized electrochemically in various concentrations of H2SO4 and HCl, and then characterized by cyclic voltammetry, as well as by impedance and Raman spectroscopy. The cyclic voltammograms of poly(o-toluidine) and poly(aniline) show that the electrochemical polymerization of these two polymers proceeds by almost identical mechanisms. The Raman spectroscopical measurements suggest that the redox reactions of poly(aniline) and poly(o-toluidine) are similar in the potential range between -0.2 and 0.7V vs. SCE. The impedance measurements showed that the conductivity of poly(o-toluidine) is an order of magnitude lower than that of the corresponding poly(aniline) form.

3D Ordered Macroporous Carbon Encapsulated ZnO Nanoparticles as a High-Performance Anode for Lithium-Ion Batteries

2017 ◽  
Vol 4 (9) ◽  
pp. 2359-2365 ◽  
Author(s):  
Chengwei Zhang ◽  
Zheng Zhang ◽  
Fuxing Yin ◽  
Yongguang Zhang ◽  
Almagul Mentbayeva ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Zno Nanoparticles ◽  
High Performance ◽  
Lithium Ion ◽  
Ordered Macroporous ◽  
Macroporous Carbon

Co3O4@Highly ordered macroporous carbon derived from a mollusc shell for supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (92) ◽  
pp. 75105-75110 ◽  
Author(s):  
Yahui Liu ◽  
Wei Yu ◽  
Li Hou ◽  
Guanhong He ◽  
Zhihong Zhu
Keyword(s):  
High Performance ◽  
Mollusc Shell ◽  
Ordered Macroporous ◽  
Macroporous Carbon

Co3O4 cubes grown on highly ordered macroporous carbon are demonstrated for high-performance supercapacitor electrodes.

scholarly journals Synthesis and Optoelectronic Characterization of Some Star-Shaped Oligomers with Benzene and Triphenylamine Cores

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Teofilia Ivan ◽  
Loredana Vacareanu ◽  
Mircea Grigoras
Keyword(s):  
Electrochemical Polymerization ◽  
Coupling Reaction ◽  
Aromatic Aldehydes ◽  
Thermal Characterization ◽  
Cyclic Voltammograms ◽  
Heck Coupling ◽  
Molecular Glasses ◽  
H Nmr ◽  
Ft Ir

Six star-shaped oligomers containing triphenylamine (D1–D3) and benzene unit (D4–D6) as cores have been synthesized by Wittig condensation or Heck coupling reaction using aromatic aldehydes and triphenylphosphonium salts or aromatic halogenated compounds with vinyl triphenylamine. All oligomers have well-defined molecular structure and high purity. Characterization of the oligomers was made by FT-IR, 1H-NMR spectroscopy, UV-Vis, and fluorescence spectroscopy. The electrochemical behavior was studied by cyclic voltammetry (CV). The cyclic voltammograms have revealed that oligomers undergo quasireversible or irreversible redox processes. The irreversible process is associated with electrochemical polymerization of oligomers by dimerization of unsubstituted triphenylamine groups. Thermal characterization was accomplished by TGA and DSC methods and evidenced that all oligomers were stable materials until 250°C and have formed stable molecular glasses after first heating scan.

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