Preparation of the novel nanocompolymers of aniline and 2-aminobenzenesulfonic acid and true (exact) determining of the amount of sulfonated monomer entered into copolymer chain

Preparation of the novel nanocompolymers of aniline and 2-aminobenzenesulfonic acid and true (exact) determining of the amount of sulfonated monomer entered into copolymer chain

The synthesis of the nanocopolymers of aniline and 2-aminobenzenesulfonic acid (2ABSA) was investigated by two various conditions: 1) under solid-state condition and at room temperature (25 ○C), and 2) in water solvent and at 4 ○C. In both methods, ammonium peroxydisulphate (APS) was used as oxidant. The base forms of the copolymers were prepared by dissolving the primary copolymers (salt form) in NaOH (0.1 M). The salt- and base- copolymers were characterized by infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), elemental analysis (CHNS) and cyclic Voltammetry (CV). The amounts of the sulfonated monomers (2ABSA) entered in the copolymer chains were calculated by comparing the sulfur percentages of the salt- and base- forms obtained from CHNS analysis. The observation of the sulfonate (-SO3H) peaks in FT-IR spectra and the result of the CHNS analysis have shown that some 2ABSA were acted as dopant anion and the rest were entered into the copolymer chains as monomer and this is the evidence of copolymers synthesis. This comparison was reported for the first time. No paper has used base-copolymers to determine the real amount of the sulfonated monomers entered in the copolymer chains. In fact, in this paper, it has been demonstrated for the first time that all sulfonated monomers do not enter into the copolymer chains, but some of them place as dopant anion next to the copolymer chains. Also, the size and morphology of the copolymers were investigated by SEM and TEM analysis. All copolymers have shown an average size of 64 to 100 nm.

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