Polyanilines phosphonate

Example 4 Polyaniline-Phosphonic Acid (PANI-PA) - Synthesis of Homopolymers of PANl-Bu/Bn/DcPA and Poly(o-aminobenzylphosphonic Add)... 

Title Use of Sulphonic, Phosphonic and Phosphoric Acids as Dopants for Polyaniline and for Conductive Polyaniline-Based Composite Materials... 

S.L. Mu, The electrocatalytic oxidation of gallic acid on polyaniline film synthesized in the presence of ferrocene phosphonic acid, Synth. Met., 139, 287-294 (2003). 

Kinlen, P.J., Y. Ding, and D.C. Silverman. 2002. Corrosion protection of mild steel using sulfonic and phosphonic acid-doped polyanilines. Corrosion 58 (6) 490. 

S. C. Ng, H. S. O. Chan, H. H. Huang, P. K. H. Ho, Poly(o-aminobenzyl-phosphonic acid) - a novel water-soluble, self-doped functionalized polyaniline, Journal of the Chemical Society-Chemical Communications 1995,1327. 

The homopolymers of PANI-Bu/Bn/DcPA (where Bu = n-butyl. Bn = benzyl, Dc = -decyl, and PA = phosphonic add) are synthesized by treating polyaniline with substituted phosphonic adds. PANI-Bu/EtPA and PANI-BnPA derivatives are prepared by adding 0.4 M of add to a finely ground 3.0 mmol PANI base. The dark-green precipitate obtained is filtered and dried under vacuum at 60 °C for approximately 15 h. To synthesize PANI-DcPA, 3.0 mmol of PANI base is dissolved in 1 1 cyclohexane-petroleum ether solution containing 0.3 M of... 

In addition to functionalization of polyanilines with sulfonic and carboxylic acids, the corresponding phosphonic acid derivatives have been prepared, o-Aminobenzylphosphonic acid was prepared as shown in Figure 20.54 [42,43]. Oxidative coupling of the above monomer in an acidic medium yielded poly(o-aminobenzylphosphonic acid) (Figure 20.55). Spectroscopic analysis was consistent with head-to-tail oxidative coupling through the /Jara-position. The as-prepared polymer was in its emeraldine oxidation state in which 43% of the N-atoms were protonated by the pendent acid. This polymer was insoluble in both non-aqueous solvents and aqueous acidic solutions. 

FTIR confirmed the successive neutralization of the phosphonic acid group. UV-vis absorption spectroscopy of the polymers exhibited hypsochromic shifts compared to the parent polyaniline due to a decreased conjugation length resulting from steric interaction between repeating units. This is consistent with... 

A covalently attached acid moiety to the polyaniline backbone can dope itself without an external dopant. A self-doped conducting polyaniline bearing phos-phonic acid, poly(2-methoxyaniline-5-phosphonic acid) (PMAP) is designed and... 

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