Synthesis and characterization of electrically conducting copolymer of aniline and <i>o</i>‐bromoaniline using methane sulfonic acid as dopant

Polyfuran (PFu), poly(2-bromoaniline) (P2BrAn), and poly(2-bromoaniline)/polyfuran (P2BrAn/PFu) composites were synthesized by coupling using various solvents and oxidants. 2-Bromoaniline (2BrAn) was polymerized using FeCl 3 and (NH 4 ) 2 S 2 O 8 in aqueous HCl medium. PFu was synthesized using FeCl 3 and SbCl 3 in anhydrous media (CHCl 3 , CH 3 CN). Furan was polymerized using both salts in CHCl 3 medium, whereas it could be polymerized using only FeCl 3 in CH 3 CN medium. The new electrically conducting composites were prepared by chemical oxidative polymerization using polyfuran synthesized with SbCl 3 and poly(2-bromoaniline). The polymers and composites were characterized using conductivity, magnetic susceptibility, infrared spectra (FTIR), UV-Vis spectra, thermal analysis (TGA), and scanning electron microscopy (SEM) measurements. It was found that PFu(SbCl 3 ) has the lowest thermal stability. Thus, the thermal stability of PFu was increased by preparing composites. The chemical structures of P2BrAns and composites have been found from UV-Vis results to contain quinone-imine units along the polymer chain. Magnetic susceptibility measurements indicated that the polymers and composites were diamagnetic or paramagnetic.

Section: Electrical Conductivity and Magnetic Susceptibilitysupporting

confidence: 51%

Polymers, composites, and characterization of conducting polyfuran and poly(2‐bromoaniline)

Gök

Sarı

Talu

2005

“…Roy et al reported on the chemical synthesis of poly(o-bromoaniline) and poly(aniline-co-o-bromoaniline) using methane sulfonic acid as a dopant in an aqueous solution. 26 Stejskal et al synthesized brominated PANI by the reaction of PANI with bromine in an aqueous medium. 27 The content of bromine in the modified polymer increased with the amount of bromine introduced into the reaction mixture.…”

Section: Introductionmentioning

confidence: 98%

Electrochemical preparation of poly(2‐bromoaniline) and poly(aniline‐co‐2‐bromoaniline) in acetonitrile

Şahin¹,

Perçin²,

Şahin³

et al. 2003

Electrochemical preparation of poly(2-bromoaniline) (PBrANI) and poly(aniline-co-2-bromoaniline) [P(An-co-2-BrAn)] was carried out in an acetonitrile solution containing tetrabutylammonium perchlorate (TBAP) and perchloric acid (HClO 4 ). The cyclic voltammograms during the copolymerization had many features similar to those for the usual polymerization of aniline. The copolymer exhibits a higher dry electrical conductivity value than that of PBrANI and a lower one than that of PANI. The observed decrease in the conductivity of the copolymer relative to PANI is attributed to the incorporation of bromine moieties into the polyaniline chain. The structure and properties of the polymer and copolymer were elucidated using cyclic voltammetry (CV), FTIR, and UV-vis spectroscopy.

“…Many soluble derivatives of polyaniline are therefore synthesized by the polymerization of ringor nitrogen-substituted aniline monomers and/or by polymerization. 16,17 Among these derivatives, poly(omethoxyaniline) has attracted much attention because of its better solubility. 18 However, its conductivity is much lower than that of polyaniline.…”

Section: Introductionmentioning

confidence: 99%

Structural and thermal characterization of poly(2‐chloroaniline)/red mud nanocomposite materials

Gök

Oğuz

2005

ABSTRACT:We report the synthesis and characterization of a series of conducting poly(2-chloroaniline) (P2ClAn)/red mud (RM) nanocomposite materials. The polymerization of 2-chloroaniline in an aqueous medium in the presence of (NH 4 ) 2 S 2 O 8 and RM resulted in the formation of a nanocomposite (P2ClAn/RM). The extent of P2ClAn loading in the composites increased with increasing oxidant and monomer concentrations but decreased with RM. The properties of the nanocomposites were characterized with Fourier transform infrared (FTIR), ultraviolet-visible (UV-vis), conductivity measurements, scanning electron microscopy, thermogravimetric analysis, and differential scanning calorimetry analysis. The inclusion of P2ClAn in the composites was confirmed by FTIR studies. The UV-vis spectra of P2ClAn/RM nanocomposites were similar to that of P2ClAn. The conductivity changed in all the composites prepared under various conditions. Thermogravimetric analyses revealed the enhanced thermal stabilities of the nanocomposites with respect to P2ClAn. Morphological images of the as-synthesized materials were also investigated with scanning electron microscopy and environmental scanning electron microscopy.