Abstract
Polyaniline (PANI) was prepared in the presence of the acidic dye scarlet 3R. Color tuning was performed on PANI through doping–dedoping processes and by changing the solvent used during the optical absorption spectroscopic measurements. The chemical structure of the resulting polymer–dye composite was analyzed using infrared absorption spectroscopy, and it showed the occurrence of secondary doping in m-cresol. The shape of the UV–Vis optical absorption spectra for the composite solution is dependent on the types of organic solvents used during the analysis, which was influenced by the conformation of PANI and the ionic interactions between PANI and scarlet 3R.
Highlights
Polyaniline (PANI) is a promising conductive polymer whose unit molecule, aniline, is popularly used as a raw material for dyestuff, pigments, and medicine [1,2]
PANI that is synthesized via aniline polymerization is stable in air and exhibits moderate electrical conductivity, which is derived from both ionic and electrical conduction in the π-conjugation of the main chain
The resulting polymer slurry was filtered, and the residue was dried under reduced pressure to give to give the reduced form of the polymer, which is abbreviated as PANI-3R(EB) (Scheme 2)
Summary
Polyaniline (PANI) is a promising conductive polymer whose unit molecule, aniline, is popularly used as a raw material for dyestuff, pigments, and medicine [1,2]. Composite materials using PANI are based on the conductivity of polymers; those combined with graphene [3] and magnetic materials [4] have been reported. Physical properties of giant magnetoresistance [5] and negative permittivity [6] for PANI have been studied. PANI that is synthesized via aniline polymerization is stable in air and exhibits moderate electrical conductivity, which is derived from both ionic and electrical conduction in the π-conjugation of the main chain. Synthesis of PANI composites with inorganic materials such as TiO2 via emulsion polymerization yields a product (PANI)
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