Organic Chemistry of Polyanilines: Tailoring Properties to Technological Applications~!2008-08-19~!2008-09-11~!2008-11-28~!

Abstract

Abstract:The use of organic chemistry reactions to introduce additional functional groups on polyanilines is described. Among the reactions discussed are: electrophilic aromatic substitution, nucleophilic addition to the aromatic rings, nucleophilic substitution on the amine groups and reactions on pendant groups. The use of combinatorial chemistry techniques, by coupling of combinatorially synthesised diazonium salts with polyaniline, to produce a functionalized polyanilines library is also reviewed. The modification of polyaniline introduces or alters different properties of the materials: solubility, self-doping and redox coupled ion exchange. The tailoring of those properties to technical applications is therefore examined.

Synthesis of phosphonic acid ring-substituted polyanilines via direct phosphonation to polymer main chains

“…According to several reports on the nucleophilic substitution of PANI, [24][25][26][27] PANI (emeraldine base) 1 was treated with an excess amount of P(OEt) 3 as a nucleophile in the presence of H 2 O in NMP at room temperature. The reaction was followed with UVvis-NIR absorption spectroscopy by taking a small amount of the sample from the reaction mixture.…”

“…[12][13][14][15][16][17][18][19] The other is post-synthetic introduction of acid moieties to PANIs. 10,11,[20][21][22][23][24][25][26][27] The former may make the polymer design more exible. However, the latter is considered to be advantageous in terms of the number of synthetic steps and the synthetic cost.…”

“…However, the latter is considered to be advantageous in terms of the number of synthetic steps and the synthetic cost. As post-modications to synthesize PANIs bearing sulfonic acid, both electrophilic 10,11,[20][21][22][23] and nucleophilic [24][25][26][27] (accompanying the reduction of the quinoid moiety) substitution reactions have been reported.…”

Impedance study of thiolated polyaniline

“…Polyaniline is sensitive to pH. The sensitivity to pH is less in PANI derivatives, such as N-and ring-substituted anilines [3], which also tend to have quite different characteristics compared with PANI [4][5][6][7]. PANI has a backbone with an amine group and a benzene ring and both can be functionalized [4,8].…”

“…PANI has a backbone with an amine group and a benzene ring and both can be functionalized [4,8]. By substitution, other properties, like the solubility and conductivity of PANI, can also be tailored [4].…”