Süleyman Yalçınkaya | Mustafa Kemal University (original) (raw)
Papers by Süleyman Yalçınkaya
Bu çalışmada, poli(pirol-ko-o-anisidin)kitosan kompozit filmleri pirol ve o-anisidinin farklı mon... more Bu çalışmada, poli(pirol-ko-o-anisidin)kitosan kompozit filmleri pirol ve o-anisidinin farklı monomer mol oranlarındaki çözeltilerinde (pirol : o-anisidin; 7:3, 1:1 ve 3:7) elektrokimyasal olarak sentezlendiler. Kompozit filmlerin sentezi dönüşümlü voltameri tekniği ile gerçekleştirildi. Kompozit filmleri FT-IR, dönüşümlü voltametri ve SEM teknikleri ile karakterize edildi. SEM analiz sonuçları o-anisidin oranı arttıkça kompozit filmlerin parçacık büyüklüklerinin giderek azaldığını ve oran daha da arttıkça düz bir yüzey halini aldığını göstermiştir. Ayrıca elektrokimyasal çalışmalar 3:7 oranındaki kompozit filminin elektrokimyasal olarak iyi bir kararlılığa sahip olduğunu ortaya koymuştur. N,N?-bis(salisiliden)-2- aminobenzilaminonikel(II) [NiL] kompleksinin kompozit film yüzeylerine immobilizasyon işlemi 0.15 M asetonitril-LiClO4 çözeltisinde 0.2-2.0 V potansiyel aralığında dönüşümlü voltametri tekniği ile gerçekleştirilmiştir. Schiff bazı metal kompleksinin kompozit filmlerinin yü...
TEZ7044Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2008.Kaynakça (s.140-145) var.xvi, 146 s. :... more TEZ7044Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2008.Kaynakça (s.140-145) var.xvi, 146 s. : res. ; 29 cm.Bu çalışmada, poli(pirol-ko-o-toluidin)'in elektrokimyasal sentezi, klorürlü ve sülfatlı çözeltilerde demirli malzemeler yüzeyinde korozyon davranışları, termal kararlılığı ve fizikokimyasal özellikleri araştırılmıştır. Kopolimer sentezi farklı monomer oranlarındaki pyrrole: o-toluidine 9:1, 8:2 and 7:3 çözeltilerde gerçekleştirilmiştir. Bütün monomer oranlarında sıcaklığın kopolimerizasyonda ve film gelişiminde çok önemli bir rol oynadığı belirlenmiştir. Kopolimer kaplamalar SEM görüntüleri, UV-Vis, FT-IR Spektroskopik teknikleri ve dönüşümlü voltametri ile karakterize edilmiştir. Ayrıca kopolimer filminin termal kararlılığı DSC ile belirlenmiştir. Kopolimer kaplamaların korozyon davranışları Elektrokimyasal İmpedans Spektroskopisi (EIS) ve anodik polarizasyon eğrileri yardımıyla araştırılmıştır.In This study, the electrochemical synthesis, corrosion behavior on iron b...
Journal of Coordination Chemistry, 2010
ABSTRACT A precursor (H3A) was synthesized by the mono condensation of 2-aminobenzylamine with sa... more ABSTRACT A precursor (H3A) was synthesized by the mono condensation of 2-aminobenzylamine with salicylaldehyde and then a tetradentade Schiff-base ligand (H2L) prepared by using H3A and 3-methoxysalicylaldehyde. The copper(II) complex of this new ligand was prepared and characterized by elemental analysis, electronic absorption, Fourier transform infrared (FT-IR), and magnetic susceptibility. For the ligand, H- and C-NMR and liquid chromatography mass spectrometry (LC–MS) spectra were obtained. The tetradentate ligand is coordinated to Cu(II) through the phenolic oxygen and azomethine nitrogen. The use of this metal complex in the preparation of a modified electrode is also described. CuL was electropolymerized on a platinum electrode surface in a 0.1 mol dm solution of lithium perchlorate in acetonitrile by cyclic voltammetry between 0 and 1.6 V versus Ag/Ag. Electrochemical properties of the electroactive polymeric film have been investigated and a surface confined polymerization mechanism was proposed.
Polymer Bulletin, 2015
ABSTRACT Polypyrrole/dextran sulphate (PPy/Dx-SO4) composite was synthesized in 1 M HCl medium by... more ABSTRACT Polypyrrole/dextran sulphate (PPy/Dx-SO4) composite was synthesized in 1 M HCl medium by chemical polymerization method. The synthesized composite was characterized using 1H-NMR, UV–Vis, FT-IR, SEM micrographs, cyclic voltammetry, TG–DTA and viscosity measurements. The SEM micrographs were clearly indicated that PPy, Dx-SO4 and PPy/Dx-SO4 composite have different morphology. The composite architecture is also seen alike as globular and agglomerate particles. The composite has better thermal stability than Dx-SO4. The results of the solubility studies indicated that the composite partially dissolved in DMSO, DMF, and NMP. Additionally, the composite was more soluble in these solvents than PPy, providing technological usefulness. The electrochemical studies showed that PPy/Dx-SO4 composite has low electrical conductivity, but it has good electrochemical stability than PPy.
![Research paper thumbnail of Electrochemical Synthesis of Poly(pyrrole-co-[Cu(salabza)]): its Electrocatalytic Activity Towards the Oxidation of Catechol](https://attachments.academia-assets.com/87780329/thumbnails/1.jpg)
](Bu makale, poli(pirol-ko-[Cu(salabza)]) kopolimerinin elektrokimyasal sentezini ve onun katekol e... more Bu makale, poli(pirol-ko-[Cu(salabza)]) kopolimerinin elektrokimyasal sentezini ve onun katekol elektro katalitik oksidasyonu üzerindeki uygulamasını içermektedir. Sentez işlemi platin elektrot yüzeyine susuz ortamda asetonitril çözeltisinde dönüşümlü voltametri tekniği ile gerçekleştirilmiştir. Kopolimerin karakterizasyonu FT-IR, UV-vis, CV, taramalı elektron mikroskopu (SEM), TG-DTA teknikleri kullanılarak yapılmıştır. SEM görüntüleri kopolimer filminin, [Cu(salabza)] ve polipirol filmlerinden farklı bir yapıya sahip olduğunu açıkça göstermektedir. Bunun yanı sıra elektrokimyasal çalışmalar kopolimer filminin kararlılığının ve elektro aktivitesinin iyi olduğunu göstermiştir. Elektro katalitik çalışmalar kopolimer kaplamanın katekol oksidasyonu için katalitik aktiviteye de sahip olduğunu göstermiştir.
Journal of Applied Polymer Science, 2020
Journal of Electroanalytical Chemistry, 2018
2-aminobenzylamine-based unsymmetrical salen-type Schiff base and its Cu (II), Ni (II), Co (II) a... more 2-aminobenzylamine-based unsymmetrical salen-type Schiff base and its Cu (II), Ni (II), Co (II) and Fe (III) metal complexes were synthesized and their structures were investigated by various spectroscopic methods. The electropolymerization of the synthesized metal complexes were achieved on the graphite electrode. The electropolymerization process was conducted by cyclic voltammetry (CV) in a 0.15 M LiClO 4 /Acetonitrile as supporting electrolyte medium. Characterization of the polymer coated electrodes were carried out by CV, SEM, EDX and UV-vis techniques. The electrocatalytic activities of graphite electrodes modified with Schiff-base metal complex were investigated in the determination of compounds such as Dopamine (DA), Catechol (CC), Cysteine (Cys) and Uric Acid (UA). These studies showed that the salen-type Schiff base-Ni(II)-modified graphite electrode gave the best result in the determination of catechol and dopamine. Square wave voltammetry showed a linear response in the range of 0.09-0.35μM and 0.22-0.58 μM with LoD of 0.03 μM and 0.06 μM for CC and DA, respectively. ACCEPTED MANUSCRIPT Highlights Unsymmetrical Schiff base metal complexes were synthesized. Metal complexes were electropolymerized onto the graphite electrode. New modified electrodes had catalytic activity on Dopamine and Catechol. SWV showed a linear response in the range of 0.09-1μM with LoD of 0.03 μM for Catechol.
SAÜ Fen Bilimleri Enstitüsü Dergisi, 2017
Journal of Molecular Structure, 2017
In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synth... more In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synthesized in various monomers feed ratio (pyrrole: o-anisidine; 9:1, 7:3, 1:1, 3:7 and 1:9) of pyrrole and o-anisidine on the platinum electrode. Electrochemical synthesis of the composite films was carried out via cyclic voltammetry technique. They were characterized by FT-IR, cyclic voltammetry, SEM micrographs, digital images, TGA and DSC techniques. The SEM results indicated that the particle size of the composite decreased with increasing o-anisidine ratio and the films became more likely to be smooth morphology. The TGA results proved that the film of the composite with 1:1 ratio showed highest final degradation temperature and lowest weight loss (83%) compared to copolymer and 9:1 1:9 composite films. The 1:1 composite film had higher thermal stability than copolymer and the other composite films (9:1 1:9). Meanwhile, electrochemical studies exhibited that the 1/9 composite film had good electrochemical stability as well.
Designed Monomers and Polymers, 2012
Poly(aniline-co-o-nitroaniline) co-polymer was synthesized by a chemical oxidation process using ... more Poly(aniline-co-o-nitroaniline) co-polymer was synthesized by a chemical oxidation process using ammonium peroxydisulfate. The reaction was carried out in aqueous HCl solution with aniline and o-nitroaniline in a molar ratio of 4:1. Although o-nitroaniline did not homo-polymerize, the co-polymer of aniline with o-nitroaniline was readly synthesized. Poly(aniline-co-o-aminoaniline) was prepared by reducing poly(aniline-co-o-nitroaniline) in Fe catalyst at 90–100°C. Co-polymer samples were characterized by FTIR, UV-Vis and H-NMR spectroscopy, DSC and cyclic voltammetry. Also, solubility of the co-polymer samples was investigated with tetrahydrofuran (THF), dimethylsulfoxide (DMSO), dimethylformamide (DMF), N-methylpyrrolidone (NMP), chloroform, acetone and pyridine. DMF and DMSO were found as the best solvents for poly(aniline-co-o-aminoaniline) and poly(aniline-co-o-nitroaniline). In addition, poly(aniline-co-o-nitroaniline) was more soluble in DMF and DMSO than poly(aniline-co-o-aminoaniline). The DSC results and cyclic voltammetry studies showed that co-polymer samples had good thermal stability and electroactivity.
Progress in Organic Coatings, 2008
ABSTRACT The electrochemical synthesis of poly(o-anisidine) homopolymer and its copolymerization ... more ABSTRACT The electrochemical synthesis of poly(o-anisidine) homopolymer and its copolymerization with pyrrole have been investigated on mild steel. The copolymer films have been synthesized from aqueous oxalic acid solutions containing different ratios of monomer concentrations: pyrrole:o-anisidine, 9:1, 8:2, 6:4, 1:1. The characterization of polymer films were achieved with FT-IR, UV–visible spectroscopy and cyclic voltammetry techniques. The electrochemical synthesis of homogeneous-stable poly(o-anisidine) film with desired thickness was very difficult on steel surface. Therefore its copolymer with pyrrole has been studied to obtain a polymer film, which could be synthesized easily and posses the good physical–chemical properties of anisidine. The kinetics and rate of copolymer film growth were strongly related to monomer feed ratio. The introduction of pyrrole unit into synthesis solution increased the rate of polymerization and the substrate surface became covered with polymer film soon, while this process required longer periods in single o-anisidine containing solution. The protective behavior of coatings has been investigated against steel corrosion in 3.5% NaCl solution. For this aim electrochemical impedance spectroscopy (EIS) and anodic polarization curves were utilized. The synthesized poly(o-anisidine) coating exhibited significant protection efficiency against mild steel corrosion. It was shown that 6:4 ratio of pyrrole and anisidine solution gave the most stable and corrosion protective copolymer coating.
Materials Chemistry and Physics, 2011
The complex of copper (II) with N,N-bis(3-methoxysalicylidene)-2-aminobenzylamine (H 2 L) was syn... more The complex of copper (II) with N,N-bis(3-methoxysalicylidene)-2-aminobenzylamine (H 2 L) was synthesized and characterized by elemental analysis, magnetic susceptibility, UV-vis. and FT-IR spectroscopy. The results showed that the tetradentate ligand coordinated to the Cu(II) ion through the azomethine nitrogen and phenolic oxygen atoms. The prepared complex [CuL] was electropolymerized on platinum electrode surface in a 0.1 mol dm −3 solution of lithium perchlorate in acetonitrile by cyclic voltammetry between 0 and 1.6 V vs. Ag/Ag +. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), conductance measurements, FT-IR and SEM were used to characterize polymer film of Cu(II) complex. The reduction of hydrogen peroxide on poly[CuL] has been investigated mainly in phosphate buffer medium (pH 7.2), between 0 and −0.8 V versus Ag/Ag + at a scan rate 0.1 V s −1 .
Designed Monomers and Polymers, 2014
ABSTRACT
Current Applied Physics
In this study, a ter-polymer film of pyrrole, o-anisidine and o-toluidine has been electrochemica... more In this study, a ter-polymer film of pyrrole, o-anisidine and o-toluidine has been electrochemically synthesized on low carbon steel. The synthesis solution was aqueous oxalic acid containing 2:1:1 monomer feed ratio between pyrrole, o-anisidine and o-toluidine, respectively. The characterization of synthesized ter-polymer film was realized with help of UV–Vis absorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) techniques. The stability of this ter-polymer film as a coating material has also been investigated on steel, in 3.5% NaCl solution. Under such severe conditions, the ter-polymer film was found to exhibit low permeability against water ingress. It was able to exhibit protective coating behavior on steel, even after 72 h exposure time. The DSC results revealed that the ter-polymer film had better thermal stability with respect to single polypyrrole film. The synthesized ter-polymer film was...
Progress in Organic Coatings, 2013
The effect of organic sulphonic acids on electrochemical, optical and conductivity properties of ... more The effect of organic sulphonic acids on electrochemical, optical and conductivity properties of poly(o-anisidine) (POA), poly(o-toluidine) (POT) and poly(o-anisidine-coo -toluidine) (POA-co-POT) thin lms has been investigated. The lms were synthesized electrochemically, individual as homopolymers and then combined as (binary copolymer) under cyclic voltammetric conditions in an aqueous solution of sulphuric acid, p-toluene sulphonic acid, sulphamic acid and sulphosalicylic acid at room temperature. The lms were electropolymerized in solution containing 0.1 M monomers and respective electrolyte (1 M sulphuric acid or organic sulphonic acid) by applying sequential linear potential scan rate of 50 mV/s between ¡0.2 and 1.0 V versus Ag/AgCl electrode. The electrosynthesized lms were characterized by cyclic voltammetry, UV-Vis spectroscopy and conductivity measurement. It is observed that the UV-Vis peaks for sulphuric acid, p-toluene sulphonic acid, sulphamic acid and sulphosalicylic acid appear in the region of the conducting emeraldine salt (ES) phase. Overall, the polymers prepared using all these three organic sulphonic acids have higher conductivity than sulphuric acid; however, the higher conductivity is observed for p-toluene sulphonic acid as electrolyte in comparison with sulphamic acid and sulphosalicylic acid. The formation of copolymer (POA-co-POT) has been supported and con rmed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) studies. A possible scheme of reaction mechanism for homo-and copolymer has been suggested.
In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synth... more In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synthesized in various monomers feed ratio (pyrrole: o-anisidine; 9:1, 7:3, 1:1, 3:7 and 1:9) of pyrrole and o-anisidine on the platinum electrode. Electrochemical synthesis of the composite films was carried out via cyclic voltammetry technique. They were characterized by FT-IR, cyclic voltammetry, SEM micrographs, digital images, TGA and DSC techniques. The SEM results indicated that the particle size of the composite decreased with increasing o-anisidine ratio and the films became more likely to be smooth morphology. The TGA results proved that the film of the composite with 1:1 ratio showed highest final degradation temperature and lowest weight loss (83%) compared to copolymer and 9:1 1:9 composite films. The 1:1 composite film had higher thermal stability than copolymer and the other composite films (9:1 1:9). Meanwhile, electrochemical studies exhibited that the 1/9 composite film had good electrochemical stability as well.
Bu çalışmada, poli(pirol-ko-o-anisidin)kitosan kompozit filmleri pirol ve o-anisidinin farklı mon... more Bu çalışmada, poli(pirol-ko-o-anisidin)kitosan kompozit filmleri pirol ve o-anisidinin farklı monomer mol oranlarındaki çözeltilerinde (pirol : o-anisidin; 7:3, 1:1 ve 3:7) elektrokimyasal olarak sentezlendiler. Kompozit filmlerin sentezi dönüşümlü voltameri tekniği ile gerçekleştirildi. Kompozit filmleri FT-IR, dönüşümlü voltametri ve SEM teknikleri ile karakterize edildi. SEM analiz sonuçları o-anisidin oranı arttıkça kompozit filmlerin parçacık büyüklüklerinin giderek azaldığını ve oran daha da arttıkça düz bir yüzey halini aldığını göstermiştir. Ayrıca elektrokimyasal çalışmalar 3:7 oranındaki kompozit filminin elektrokimyasal olarak iyi bir kararlılığa sahip olduğunu ortaya koymuştur. N,N?-bis(salisiliden)-2- aminobenzilaminonikel(II) [NiL] kompleksinin kompozit film yüzeylerine immobilizasyon işlemi 0.15 M asetonitril-LiClO4 çözeltisinde 0.2-2.0 V potansiyel aralığında dönüşümlü voltametri tekniği ile gerçekleştirilmiştir. Schiff bazı metal kompleksinin kompozit filmlerinin yü...
TEZ7044Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2008.Kaynakça (s.140-145) var.xvi, 146 s. :... more TEZ7044Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2008.Kaynakça (s.140-145) var.xvi, 146 s. : res. ; 29 cm.Bu çalışmada, poli(pirol-ko-o-toluidin)'in elektrokimyasal sentezi, klorürlü ve sülfatlı çözeltilerde demirli malzemeler yüzeyinde korozyon davranışları, termal kararlılığı ve fizikokimyasal özellikleri araştırılmıştır. Kopolimer sentezi farklı monomer oranlarındaki pyrrole: o-toluidine 9:1, 8:2 and 7:3 çözeltilerde gerçekleştirilmiştir. Bütün monomer oranlarında sıcaklığın kopolimerizasyonda ve film gelişiminde çok önemli bir rol oynadığı belirlenmiştir. Kopolimer kaplamalar SEM görüntüleri, UV-Vis, FT-IR Spektroskopik teknikleri ve dönüşümlü voltametri ile karakterize edilmiştir. Ayrıca kopolimer filminin termal kararlılığı DSC ile belirlenmiştir. Kopolimer kaplamaların korozyon davranışları Elektrokimyasal İmpedans Spektroskopisi (EIS) ve anodik polarizasyon eğrileri yardımıyla araştırılmıştır.In This study, the electrochemical synthesis, corrosion behavior on iron b...
Journal of Coordination Chemistry, 2010
ABSTRACT A precursor (H3A) was synthesized by the mono condensation of 2-aminobenzylamine with sa... more ABSTRACT A precursor (H3A) was synthesized by the mono condensation of 2-aminobenzylamine with salicylaldehyde and then a tetradentade Schiff-base ligand (H2L) prepared by using H3A and 3-methoxysalicylaldehyde. The copper(II) complex of this new ligand was prepared and characterized by elemental analysis, electronic absorption, Fourier transform infrared (FT-IR), and magnetic susceptibility. For the ligand, H- and C-NMR and liquid chromatography mass spectrometry (LC–MS) spectra were obtained. The tetradentate ligand is coordinated to Cu(II) through the phenolic oxygen and azomethine nitrogen. The use of this metal complex in the preparation of a modified electrode is also described. CuL was electropolymerized on a platinum electrode surface in a 0.1 mol dm solution of lithium perchlorate in acetonitrile by cyclic voltammetry between 0 and 1.6 V versus Ag/Ag. Electrochemical properties of the electroactive polymeric film have been investigated and a surface confined polymerization mechanism was proposed.
Polymer Bulletin, 2015
ABSTRACT Polypyrrole/dextran sulphate (PPy/Dx-SO4) composite was synthesized in 1 M HCl medium by... more ABSTRACT Polypyrrole/dextran sulphate (PPy/Dx-SO4) composite was synthesized in 1 M HCl medium by chemical polymerization method. The synthesized composite was characterized using 1H-NMR, UV–Vis, FT-IR, SEM micrographs, cyclic voltammetry, TG–DTA and viscosity measurements. The SEM micrographs were clearly indicated that PPy, Dx-SO4 and PPy/Dx-SO4 composite have different morphology. The composite architecture is also seen alike as globular and agglomerate particles. The composite has better thermal stability than Dx-SO4. The results of the solubility studies indicated that the composite partially dissolved in DMSO, DMF, and NMP. Additionally, the composite was more soluble in these solvents than PPy, providing technological usefulness. The electrochemical studies showed that PPy/Dx-SO4 composite has low electrical conductivity, but it has good electrochemical stability than PPy.
Bu makale, poli(pirol-ko-[Cu(salabza)]) kopolimerinin elektrokimyasal sentezini ve onun katekol e... more Bu makale, poli(pirol-ko-[Cu(salabza)]) kopolimerinin elektrokimyasal sentezini ve onun katekol elektro katalitik oksidasyonu üzerindeki uygulamasını içermektedir. Sentez işlemi platin elektrot yüzeyine susuz ortamda asetonitril çözeltisinde dönüşümlü voltametri tekniği ile gerçekleştirilmiştir. Kopolimerin karakterizasyonu FT-IR, UV-vis, CV, taramalı elektron mikroskopu (SEM), TG-DTA teknikleri kullanılarak yapılmıştır. SEM görüntüleri kopolimer filminin, [Cu(salabza)] ve polipirol filmlerinden farklı bir yapıya sahip olduğunu açıkça göstermektedir. Bunun yanı sıra elektrokimyasal çalışmalar kopolimer filminin kararlılığının ve elektro aktivitesinin iyi olduğunu göstermiştir. Elektro katalitik çalışmalar kopolimer kaplamanın katekol oksidasyonu için katalitik aktiviteye de sahip olduğunu göstermiştir.
Journal of Applied Polymer Science, 2020
Journal of Electroanalytical Chemistry, 2018
2-aminobenzylamine-based unsymmetrical salen-type Schiff base and its Cu (II), Ni (II), Co (II) a... more 2-aminobenzylamine-based unsymmetrical salen-type Schiff base and its Cu (II), Ni (II), Co (II) and Fe (III) metal complexes were synthesized and their structures were investigated by various spectroscopic methods. The electropolymerization of the synthesized metal complexes were achieved on the graphite electrode. The electropolymerization process was conducted by cyclic voltammetry (CV) in a 0.15 M LiClO 4 /Acetonitrile as supporting electrolyte medium. Characterization of the polymer coated electrodes were carried out by CV, SEM, EDX and UV-vis techniques. The electrocatalytic activities of graphite electrodes modified with Schiff-base metal complex were investigated in the determination of compounds such as Dopamine (DA), Catechol (CC), Cysteine (Cys) and Uric Acid (UA). These studies showed that the salen-type Schiff base-Ni(II)-modified graphite electrode gave the best result in the determination of catechol and dopamine. Square wave voltammetry showed a linear response in the range of 0.09-0.35μM and 0.22-0.58 μM with LoD of 0.03 μM and 0.06 μM for CC and DA, respectively. ACCEPTED MANUSCRIPT Highlights Unsymmetrical Schiff base metal complexes were synthesized. Metal complexes were electropolymerized onto the graphite electrode. New modified electrodes had catalytic activity on Dopamine and Catechol. SWV showed a linear response in the range of 0.09-1μM with LoD of 0.03 μM for Catechol.
SAÜ Fen Bilimleri Enstitüsü Dergisi, 2017
Journal of Molecular Structure, 2017
In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synth... more In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synthesized in various monomers feed ratio (pyrrole: o-anisidine; 9:1, 7:3, 1:1, 3:7 and 1:9) of pyrrole and o-anisidine on the platinum electrode. Electrochemical synthesis of the composite films was carried out via cyclic voltammetry technique. They were characterized by FT-IR, cyclic voltammetry, SEM micrographs, digital images, TGA and DSC techniques. The SEM results indicated that the particle size of the composite decreased with increasing o-anisidine ratio and the films became more likely to be smooth morphology. The TGA results proved that the film of the composite with 1:1 ratio showed highest final degradation temperature and lowest weight loss (83%) compared to copolymer and 9:1 1:9 composite films. The 1:1 composite film had higher thermal stability than copolymer and the other composite films (9:1 1:9). Meanwhile, electrochemical studies exhibited that the 1/9 composite film had good electrochemical stability as well.
Designed Monomers and Polymers, 2012
Poly(aniline-co-o-nitroaniline) co-polymer was synthesized by a chemical oxidation process using ... more Poly(aniline-co-o-nitroaniline) co-polymer was synthesized by a chemical oxidation process using ammonium peroxydisulfate. The reaction was carried out in aqueous HCl solution with aniline and o-nitroaniline in a molar ratio of 4:1. Although o-nitroaniline did not homo-polymerize, the co-polymer of aniline with o-nitroaniline was readly synthesized. Poly(aniline-co-o-aminoaniline) was prepared by reducing poly(aniline-co-o-nitroaniline) in Fe catalyst at 90–100°C. Co-polymer samples were characterized by FTIR, UV-Vis and H-NMR spectroscopy, DSC and cyclic voltammetry. Also, solubility of the co-polymer samples was investigated with tetrahydrofuran (THF), dimethylsulfoxide (DMSO), dimethylformamide (DMF), N-methylpyrrolidone (NMP), chloroform, acetone and pyridine. DMF and DMSO were found as the best solvents for poly(aniline-co-o-aminoaniline) and poly(aniline-co-o-nitroaniline). In addition, poly(aniline-co-o-nitroaniline) was more soluble in DMF and DMSO than poly(aniline-co-o-aminoaniline). The DSC results and cyclic voltammetry studies showed that co-polymer samples had good thermal stability and electroactivity.
Progress in Organic Coatings, 2008
ABSTRACT The electrochemical synthesis of poly(o-anisidine) homopolymer and its copolymerization ... more ABSTRACT The electrochemical synthesis of poly(o-anisidine) homopolymer and its copolymerization with pyrrole have been investigated on mild steel. The copolymer films have been synthesized from aqueous oxalic acid solutions containing different ratios of monomer concentrations: pyrrole:o-anisidine, 9:1, 8:2, 6:4, 1:1. The characterization of polymer films were achieved with FT-IR, UV–visible spectroscopy and cyclic voltammetry techniques. The electrochemical synthesis of homogeneous-stable poly(o-anisidine) film with desired thickness was very difficult on steel surface. Therefore its copolymer with pyrrole has been studied to obtain a polymer film, which could be synthesized easily and posses the good physical–chemical properties of anisidine. The kinetics and rate of copolymer film growth were strongly related to monomer feed ratio. The introduction of pyrrole unit into synthesis solution increased the rate of polymerization and the substrate surface became covered with polymer film soon, while this process required longer periods in single o-anisidine containing solution. The protective behavior of coatings has been investigated against steel corrosion in 3.5% NaCl solution. For this aim electrochemical impedance spectroscopy (EIS) and anodic polarization curves were utilized. The synthesized poly(o-anisidine) coating exhibited significant protection efficiency against mild steel corrosion. It was shown that 6:4 ratio of pyrrole and anisidine solution gave the most stable and corrosion protective copolymer coating.
Materials Chemistry and Physics, 2011
The complex of copper (II) with N,N-bis(3-methoxysalicylidene)-2-aminobenzylamine (H 2 L) was syn... more The complex of copper (II) with N,N-bis(3-methoxysalicylidene)-2-aminobenzylamine (H 2 L) was synthesized and characterized by elemental analysis, magnetic susceptibility, UV-vis. and FT-IR spectroscopy. The results showed that the tetradentate ligand coordinated to the Cu(II) ion through the azomethine nitrogen and phenolic oxygen atoms. The prepared complex [CuL] was electropolymerized on platinum electrode surface in a 0.1 mol dm −3 solution of lithium perchlorate in acetonitrile by cyclic voltammetry between 0 and 1.6 V vs. Ag/Ag +. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), conductance measurements, FT-IR and SEM were used to characterize polymer film of Cu(II) complex. The reduction of hydrogen peroxide on poly[CuL] has been investigated mainly in phosphate buffer medium (pH 7.2), between 0 and −0.8 V versus Ag/Ag + at a scan rate 0.1 V s −1 .
Designed Monomers and Polymers, 2014
ABSTRACT
Current Applied Physics
In this study, a ter-polymer film of pyrrole, o-anisidine and o-toluidine has been electrochemica... more In this study, a ter-polymer film of pyrrole, o-anisidine and o-toluidine has been electrochemically synthesized on low carbon steel. The synthesis solution was aqueous oxalic acid containing 2:1:1 monomer feed ratio between pyrrole, o-anisidine and o-toluidine, respectively. The characterization of synthesized ter-polymer film was realized with help of UV–Vis absorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) techniques. The stability of this ter-polymer film as a coating material has also been investigated on steel, in 3.5% NaCl solution. Under such severe conditions, the ter-polymer film was found to exhibit low permeability against water ingress. It was able to exhibit protective coating behavior on steel, even after 72 h exposure time. The DSC results revealed that the ter-polymer film had better thermal stability with respect to single polypyrrole film. The synthesized ter-polymer film was...
Progress in Organic Coatings, 2013
The effect of organic sulphonic acids on electrochemical, optical and conductivity properties of ... more The effect of organic sulphonic acids on electrochemical, optical and conductivity properties of poly(o-anisidine) (POA), poly(o-toluidine) (POT) and poly(o-anisidine-coo -toluidine) (POA-co-POT) thin lms has been investigated. The lms were synthesized electrochemically, individual as homopolymers and then combined as (binary copolymer) under cyclic voltammetric conditions in an aqueous solution of sulphuric acid, p-toluene sulphonic acid, sulphamic acid and sulphosalicylic acid at room temperature. The lms were electropolymerized in solution containing 0.1 M monomers and respective electrolyte (1 M sulphuric acid or organic sulphonic acid) by applying sequential linear potential scan rate of 50 mV/s between ¡0.2 and 1.0 V versus Ag/AgCl electrode. The electrosynthesized lms were characterized by cyclic voltammetry, UV-Vis spectroscopy and conductivity measurement. It is observed that the UV-Vis peaks for sulphuric acid, p-toluene sulphonic acid, sulphamic acid and sulphosalicylic acid appear in the region of the conducting emeraldine salt (ES) phase. Overall, the polymers prepared using all these three organic sulphonic acids have higher conductivity than sulphuric acid; however, the higher conductivity is observed for p-toluene sulphonic acid as electrolyte in comparison with sulphamic acid and sulphosalicylic acid. The formation of copolymer (POA-co-POT) has been supported and con rmed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) studies. A possible scheme of reaction mechanism for homo-and copolymer has been suggested.
In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synth... more In this study, poly(pyrrole-coo -anisidine)/chitosan composite films were electrochemically synthesized in various monomers feed ratio (pyrrole: o-anisidine; 9:1, 7:3, 1:1, 3:7 and 1:9) of pyrrole and o-anisidine on the platinum electrode. Electrochemical synthesis of the composite films was carried out via cyclic voltammetry technique. They were characterized by FT-IR, cyclic voltammetry, SEM micrographs, digital images, TGA and DSC techniques. The SEM results indicated that the particle size of the composite decreased with increasing o-anisidine ratio and the films became more likely to be smooth morphology. The TGA results proved that the film of the composite with 1:1 ratio showed highest final degradation temperature and lowest weight loss (83%) compared to copolymer and 9:1 1:9 composite films. The 1:1 composite film had higher thermal stability than copolymer and the other composite films (9:1 1:9). Meanwhile, electrochemical studies exhibited that the 1/9 composite film had good electrochemical stability as well.