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

Abstract

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.

Preparation of bromo‐substituted polyaniline with excellent antibacterial activity

“…These changes are ascribed to the electron withdrawing effect and steric effect of bromine substituent . In addition, some new peaks are found in dedoped Br‐PANI such as the bands at 1059 and 1034 cm −1 [also exist in the spectra of poly(2‐bromoaniline)], which are related to the multi‐substituted structure of the benzene ring, and the peak intensities increase with increase in the bromine content …”

“…In addition, the synthesize method of Br‐PANI, with the structure of CBr, has been reported in recent years. Currently, reported synthesis methods of Br‐PANI mostly adopt the method of bromoaniline polymerization, which costs a lot but the yield is low . There are also some synthetic methods like brominating PANI with Br 2 or other bromine like antioxidants .…”

Polythiophene nanoparticles in aqueous media

“…Despite the content of additive, these conducting polymers can, after doping, reach the electrical conductivity characteristic for metals. Thus, the number of reports in the literature describing colloidal dispersions of conductive polymers is constantly growing and the process to obtain a conductive polymer emulsion by polymerization method becomes an important branch of material research …”

Synthesis of PEDOT Nanoparticles and Vesicles by Dispersion Polymerization in Alcoholic Media

“…In order to overcome this drawback, many research groups enhanced the solubility of conjugated polymers by introducing side chains to the rigid backbone or by preparing composites with other polymers. [4] Another route to ease the processability of conjugated polymers is to synthesize them under the form of sterically stabilized particles. For instance, aqueous dispersions of conjugated polymers have been prepared by chemical oxidative polymerization of the corresponding monomers such as pyrrole or aniline in the presence of suitable water-soluble steric stabilizers.…”