Polypyrrole, sulfonated derivatives

S. Takeoka, T. Kara, K. Yamamoto, and E. Tsuchida, Thermal stabilization of polypyrrole by incorporation of aromatic sulfonate derivatives as dopants, Chem. Lett., 25, 253 (1996). 

Song, E.-H. and W.-K. Paik (1998). Polypyrrole doped with sulfonate derivatives of metalloporphyrins Use in cathodic reduction of oxygen in acidic and basic solutions. Bull. Korean Chem. Soc. 19(2), 183-188. 

Polyaniline is less tolerant of preparation conditions than polypyrrole, and the list of anion dopants used in the preparation is more limited. However, subsequent replacement of the anion used in preparation by a dodecylben-zene sulfonate makes polyaniline become soluble in solvents such as Af-methyl pyrrolidone (NMP), or zn-cresol, and it can be spin-coated or otherwise solution-processed. In a similar way derivatives of aniline, such as... 

Polyaniline and its substituted derivatives, such as poly(o-toluidine), poly(o-anisidine), poly(N-methylaniline), poly(N-ethylaniline), poly(2,3-dimethylaniline), poly(2,5-dimethylaniline) and poly (diphenylamine) have been reported [36] to show measurable responses (sensitivity 60%) for short chain alcohols (viz., methanol, ethanol and propanol) at concentrations up to 3000 ppm. The change (decrease) in resistance of the polymers on exposure to alcohol vapors has been explained based on the vapor-induced change in the crystallinity of the polymer. Polypyrrole (PPy) incorporated with dodecyl benzene sulfonic acid and ammonium persulfate has been reported to show a linear change in resistance when exposed to methanol vapor in the range 87-5000 ppm [37]. The response is rapid and reversible at room temperature. 

Kudoh, Y, K. Akami, and Y. Matsuya. 1998. Properties of chemically prepared polypyrrole with an aqueous solution containing Fe2(S04)3, a sulfonic surfactant and a phenol derivative. Synth Met 95 191. 

The interaction of PC-12 cells, an immortal nervelike cell line derived from rat pheochromocytoma, with polypyrrole thin films doped with poly(styrene sulfonate) dopant has been studied by Shastri et al. [51,52]. Their studies have shown that PC-12 cells interact and differentiate in a more pronounced manner on polypyrrole substrates as compared with tissue culture polystyrene (TCPS) and poly(L-lactic acid) (PLA) controls in the presence of soluble NGF. Using quantitative image analysis techniques, it has been shown that both the number and length of neurites expressed by the cells on polypyrrole substrates are significantly greater... 

SELF-DOPED POLYPYRROLES 3.1 Sulfonic acid derivatives... 

Ikble Vin. Stabilizing Effect of Doping Polypyrrole with Various Sulfonic Acid Derivatives... 

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