Polymerization Of O-anisidine Research Articles

Simultaneous Deposition of Poly(o-anisidine) and Noble Ag Particles on Wool Fabric and The Evaluation of Its Performance as Catalyst in Dye Reduction

The conductive poly(o-anisidine) (POA) and noble Ag particles were simultaneously deposited on wool fabrics, by the polymerization of o-anisidine with the oxidant mixtures of silver nitrate and ammonium persulfate in different sulfonic acids media. The effect of concentrations of sulfonic acids was investigated on the contents of conductive components (POA/Ag%) and the volume resistivity of the composites. The change in the surface morphology of POA coating, distribution of Ag particles and conformance of noble Ag particles were identified with SEM, EDX, and XRD techniques, respectively. It was observed that the usage of sulfonic acids significantly increased the coating density of the POA/Ag, compared to a control sample prepared in 1.0 M HNO3 solution. The composites were tested in the catalytic reduction of a dye molecule (methylene blue) with the existence of excess sodium borohydride, and a relatively high catalytic activity (70%) was obtained at 75 min compared to a control POA/wool sample.

Synthesis, Characterization and in vitro Drug Release Studies of Sonolytically Intercalated Poly(o-anisidine)/Montmorillonite Nanocomposites

In the present study, in situ intercalation and polymerization of o-anisidine within montmorillonite (MMT) clay was carried out via ultrasonication using different loadings of o-anisidine (12.5 wt%, 25 wt%, and 50 wt%). Infrared (IR) spectra indicated successful incorporation of poly(o-anisidine) (PAnis) in MMT. Ultraviolet (UV)-visible spectra confirmed the polaronic state of nanocomposites, while X-ray diffraction (XRD) analysis revealed intercalation of PAnis in the interlayer space of MMT. Transmission electron microscope (TEM) and optical micrographs showed nanomorphology of prepared nanocomposites. The nanocomposites were modified by loading with anti-migraine drug in different concentrations to investigate the adsorption profiles in gastric fluid (pH 1.2) and intestinal fluid (pH 7.4). The adsorption profiles followed the Langmuir isotherm. Release kinetics followed zero order model and parabolic diffusion model in gastric fluid (pH 1.2) and intestinal fluid (pH 7.4). The nanocomposites were found to show fast release behavior and hold potential to be used as an effective antidepressant drug delivery vehicle.

Template-Free Growth of Aligned Bundles of Conducting Polymer Nanowires

Aligned bundles of conducting polymer nanowires are generated in situ during the polymerization of o-anisidine. The presence of an appropriate initiator, a prolonged reaction time, and careful tuning of reaction conditions are crucial parameters for producing aligned nanowires. Mechanistic studies suggest hydrogen bonding between the substituents on the monomer and the polymer backbone is important for promoting alignment.

Synthesis of poly(O‐anisidine) coatings on low carbon steel by electrochemical polymerization of O‐anisidine

AbstractThe poly(O‐anisidine) (POA) coatings have been synthesized on low carbon steel (LCS) substrates by electrochemical polymerization (ECP) of O‐anisidine. The synthesis of POA coatings was carried out under cyclic voltammetric and galvanostatic conditions from an aqueous solution of oxalic acid. It has been observed that the formation of POA coatings on LCS occurs after the passivation of its surface via the formation of polycrystalline iron oxalate (FeC2O4·2H2O) interphase. The formation of iron oxalate interphase is confirmed by fourier transform infrared spectroscopy, glancing angle x‐ray diffraction (GAXRD) measurements and scanning electron microscopy (SEM). Uniform, granular, and strongly adherent dark green POA coatings were obtained on the LCS substrate by ECP of O‐anisidine. These coatings were characterized by cyclic voltammetry (CV), potential–time (E–t) curves, UV‐visible absorption spectroscopy and SEM. The potential–time curve is characterized by an induction time before the ECP of O‐anisidine. The induction time is found to be dependent on the applied current density. The optical absorption spectroscopy study reveals the formation of conducting emeraldine salt phase of POA. Our results reveal that the oxalic acid is a suitable medium for the ECP of O‐anisidine on the LCS substrate and it favors the formation of emeraldine salt (ES) phase of POA. © 2002 John Wiley & Sons, Inc. Adv Polym Techn 21: 33–43, 2002; DOI 10.1002/adv.10006

Electrochemical deposition of poly(o-anisidine) and polypyrrole at octadecanethiol coated gold electrodes

The o-anisidine and pyrrole have been polymerized by the electrochemical oxidation of monomers on gold electrodes, covered with self-assembled monolayers. The obtained polymer–monolayer systems have been investigated by cyclic voltammetry in aqueous supporting electrolyte solutions containing K4Fe(CN)6 and Ru(NH3)6Cl3. The deposition of conducting polymers strongly depends on the integrity of a monolayer. In the case of a large number of SAM defects, the polymerization of o-anisidine and pyrrole leads to the formation of nuclei of the conducting polymer in the insulating matrix of the thiol monolayer. When the polymer is in the conducting (oxidized) form, the nuclei act as an array of microelectrodes. The polarogram-shaped voltammograms obtained for K4Fe(CN)6 confirm the hemispherical diffusion of redox species to the polymer nuclei. When the polymer is in the non-conducting (reduced) form, the polymer–octadecanethiol layer blocks the redox processes on the electrode. The exponential-type CV curves observed for Ru(NH3)6Cl3, when the polymer is in its non-conducting state, can be assigned to the tunnelling of electrons through the passivating layer. The use of monolayers with a low number of defects influences the mechanism of polymer growth. Thus, the polypyrrole grows on the layer of thiols, and the poly(o-anisidine) forms polymer nuclei.