Electrochemical synthesis of polyaniline in the presence of poly(amidosulfonic acid)s with different rigidity of polymer backbone and characterization of the films obtained

On the nature of influence of polyelectrolyte molecular weight on aniline electropolymerization

“…Firstly, the acceleration of PANI electropolymerization (compared to the polymerizations in inorganic acids) was observed in the cases of adding even small amounts of polyelectrolyte into reaction medium containing aniline and inorganic acid [3-9, 11, 12] or using polymer electrolyte only [10,[13][14][15][16]. This higher aniline polymerization rate in the presence of polyelectrolyte at lower concentration of the reagents still got no proper explanation.…”

“…The using of different polymer electrolytes opens perspectives for modification of the morphology of PANI films [3,6,8,9,[14][15][16] and optical, electrochemical, and other properties of PANI films [6,[9][10][11][12][13][14][15][16] that are highly necessary for direct practical application of such systems.…”

“…Among preparation methods of PANI, the electrodeposition is known to give the material free of the initial monomer and oxidant contamination [2] that allows considering this method as technology and environmentally friendly one. To improve physicochemical properties of PANI films, polymer electrolytes (namely, polymeric acids) have been used [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. PANI films thus obtained are characterized by reversible redox reaction and fast redox kinetics up to pH ∼4 [10] or even neutral [11] and alkaline pH [12], independence of the redox reaction rate on the PANI film thickness [10].…”

Electrochromic Properties of Polyaniline-Based Hybrid Organic/Inorganic Materials

“…In the reduced state, one can notice a strong absorption peak at 317 nm, attributed to the yellow colored leucoemeraldine form of PAni (benzenoid π-π* transition). 15,52 As the applied potential was increasing, a decrease in the intensity of the absorbance at 317 nm was observed simultaneously to the appearance of a new absorption at 443 nm, corresponding to the polymer in the neutral state (E = 0.0 V). At more anodic potentials, a new absorbance band in the NIR region (λ max = 1066 nm) can be seen concomitantly with the band at λ max = 443 nm, characteristic to the PAni emeraldine form.…”

“…Despite PAni can be synthesized by chemical 14 or electrochemical 15 polymerization methods described in the literature, PAni films with good mechanical properties and adherence to a surface are not usually achieved from the conventional chemical methods of synthesis, which yield PAni as an insoluble and infusible bulky powder. 16 In order to increase the processability and mechanical properties of PAni, significant efforts have been done in preparation of blends based on PAni with other appropriate polymers that have good physical properties, 17,18 such as polystyrene, 19 polyamide, 20 and polysaccharides like cellulose, starch and chitosan.…”