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

Abstract

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.

Preparation of bromo‐substituted polyaniline with excellent antibacterial activity

“…The spectra are dominated by two broad absorption bands. The first one (∼305 nm) corresponds to the π–π* transition of the benzenoid rings, and the second (560–650 nm) closely resembles the benzenoid–quinoid transition in the polymer . In addition, when the bromination degree increases, a regular blue‐shift can be seen.…”

“…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 .…”

Electrochemical polymerization of fluoro‐ and chloro‐substituted anilines and copolymers with aniline

“…The electrochemical behavior of the films in basic and acidic solutions is shown in Figures 6 and 7, respectively. PANI,31 poly(2‐bromoaniline) (PBrANI),21 and PIANI20 lose their electroactivities completely even after a few cycles by the addition of small amounts of pyridine (5 m M ) into the TBAP/acetonitrile solution. In the cyclic voltammogram of PFANI and PClANI films in a basic blank solution containing 0.1 M TBAP and 5 m M pyridine, the oxidation and reduction peak of the films disappear after a few potential scans [Fig.…”

“…The measured electrical conductivity of the homopolymers, poly(2‐chloroaniline) (PClANI) and poly(2‐iodoaniline) (PIANI), was less than 10 −6 S/cm, and the electrical conductivity of the copolymers was strongly dependent on the amount of the substituted aniline incorporated. Recently, we investigated the electrochemical polymerization of 2‐iodoaniline20 and 2‐bromoaniline21 and their copolymerization with aniline in an acetonitrile solution. We obtained soluble homopolymers and copolymers in common organic solvents.…”

Improvement of Mechanical Properties for Electrical Conductive Polymer Composites

“…PANI can be used in active electrodes, rechargeable batteries, etc. [11]. However, its applications are limited by its poor mechanical properties.…”