Properties of Polyaniline Synthesized in Ionic Liquid (l-Ethyl-3-methylimidazolium-ethyl sulphate).

T he electroactive polyaniline at high pH was electrochemically synthesized in a solution containing 0.2 mol.dm-3 aniline and ionic liquid, 1-ethyl-3-methylimida-zohum-ethyl sulphate (EMIES). The cyclic voltammograms of the polyaniline were performed in 1.0 mol.dm-3 KCI in a range of pH from 8.0 to 12.0 between 0 0 and IrtJfv J° In The,?sults indicated onlV 144% decay of the electrochemical activity when the polyaniline was moved from pH 8.0 to 10.0. The polyaniline still retains good electrochemical activity at pH 12.0. The results of UV-visible and FTIR spectrum reveal that the framework of polyaniline synthesized in EMIES is similar to Sl? p° y ^nehSynthesized in HCL The dermal behaviour of the polyaniline pre- , S Sh°WS a three steP we 9ht loss process, they are at about 100°C 200-EMIEst nmTf °O ? £spective|y- The conductivity of polyaniline synthesized in EMIES is 0 011 S.cm-1. After immersion of polyaniline into 1.0 mol.dm-3 HCI or 1 0 mol.dm-J KCI for one hour, its conductivity enhances to 0.53 or 0 052 S cm-1 respec tively. Based on the results of osmometry, the average molecular weight of the polyaniline ,s about 4.97x104. The polyaniline can be dissolved in DMF and other common organic solvents but little in water, which is very favourable to structural analysis and applications of polyaniline.