Chemical modification of polyaniline by N-grafting of polystyrenic chains synthesized via nitroxide-mediated polymerization

Abstract

obtido foi caracterizado por espectroscopia no infravermelho por transformada de Fourier (FTIR), varredura diferencial de calorimetria (DSC) e análise termogravimétrica (TGA). Propriedades óticas do (PSt-co-PMSt)-g-PANI nos estados não-dopado e dopado foram obtidas usando espectroscopia no ultravioleta-visível (UV-Vis), e condutividade elétrica a temperatura ambiente foi medida usando amostras nas quais os materiais condutores foram ensanduichados entre dois eletrodos de Ni. Além disso, eletroatividade do terpolímero sintetizado foi verificada sob condições voltamétricas sobre a superfície do eletrodo de trabalho de carbono vítreo (GCE). A solubilidade do terpolímero (PSt-co-PMSt)-g-PANI foi examinada em solventes orgânicos comuns, tais como, tetrahidrofurano (THF), clorofórmio e xileno.This study aims to explore an effective route for the preparation of conductive N-substituted polyaniline (PANI) by the incorporation of brominated poly(styrene-co-p-methylstyrene) onto the emeraldine form of polyaniline. For this purpose, at first, poly(styrene-co-p-methylstyrene) was synthesized via nitroxide-mediated polymerization (NMP), and then, N-bromosuccinimide was used as brominating agent to obtain a copolymer with bromine. Thereafter, deprotonated polyaniline was reacted with brominated poly(styrene-co-p-methylstyrene) to prepare the poly(styrene-co-p-methylstyrene)-graft-polyaniline [(PSt-co-PMSt)-g-PANI] terpolymer through N-grafting reaction. The terpolymer was characterized by Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Optical properties of (PSt-co-PMSt)-g-PANI in the undoped and doped states were obtained by ultraviolet-visible spectroscopy (UV-Vis), and electrical conductivity at room temperature was measured using samples in which the conductive materials was sandwiched between two Ni electrodes. Moreover, electroactivity of the synthesized terpolymer was verified under cyclic voltammetric conditions on the surface of the working glassy carbon electrode (GCE). The solubility of (PSt-co-PMSt)-g-PANI terpolymer was examined in common organic solvents, such as, tetrahydrofuran (THF), chloroform and xylene.

Effect of in-situ oxidative preparation on electrical properties of Epoxy/PANi/MWCNTs nanocomposites

“…The peak around 1460 cm -1 and around 1500-1600 attributed to the benzoid [11,[16][17][18] and C=C stretching quinoid ring [11,16,17], respectively. The peak near approximately 1720 cm -1 assigned to C=O stretching of the carbonyl group [19].…”

“…The peaks at 1044 and 2930 cm -1 were considered to the effect of p-TSA as a surfactant dopant and corresponded to the SO 3-group of p-TSA and the stretching vibration methyl(-CH3) group, respectively [16]. The peak near 3300 cm -1 attributed to epoxy OH [20] and stretching NH [16][17][18] too that have been almost together. OH peak in all samples are available and with the increase of carbon intensity increases that it represents the link between the nanotubes and the epoxy.…”

Enhanced catalytic and supercapacitor activities of DNA encapsulated β-MnO2nanomaterials

“…49,50 Thus, the FTIR analysis clearly shows the formation of an emeraldine salt. The formation of the product was further confirmed by 1 H NMR spectroscopy studies, as shown in Fig.…”

Nanostructured star‐shaped polythiophene with tannic acid core: Synthesis, characterization, and its physicochemical properties

“…Similar to most of the conducting polymers (e.g., polyaniline, polypyrrole, and polyfuran), the PTh can be synthesized by both chemical and electrochemical oxidation polymerization methods . In addition, it is well established that, the electrochemical process is more advantageous since film properties such as conductivity and thickness can be controlled by the electrochemical parameters such as current density, substrate, pH, nature, and concentration of electrolyte.…”