Title: POLYANILINE DOPED WITH SULPHOSALICYLIC, SALICYLIC AND CITRIC ACID IN SOLUTION AND SOLID-STATE
Abstract: Considerable progress has been made in characterizing and understanding the properties of polyaniline doped with some protonic acids . In this work polyaniline was synthesized by chemical method in the presence of HCI, then undoped polyanilinewas obtained with NH3solution. The undoped polyaniline was doped with the protonic acid such as sulphosalicylic acid, salicylic acid and citric acid. The protonic acids can be used to dope poly-aniline (PANT) by mixing a protonic acid in common solvents such as N-methyl pyrrolidone and dimethylformamide. The structure andpropertiesof protonic acid doped-PANT are investigated by UV-vis, IR and conductivity measurement . It is found that the PANI, therein, is doped by protonation of imine nitrogen . In the case of protonation-doped PANI, polaronslbipolarons are generated as reflected in the presence of UV-vis absorption peaks at 420 and 850 nm . The minimum amount of appropriate acid to obtain optimum level of doping was estimated by UV spectroscopy. Also polyaniline base was doped with these acids by blending in the solid-state . The electrical conductivity in the solid state increased several times after heating the mixture and increasing the heating time. The dependence of the electrical conductivity on the composition of blends differs for the partly protonated polyaniline and mixtures of protonated polyaniline with an excess acid.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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Cited By Count: 7
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