POLYMERIZATION OF ANILINE IN AN AQUEOUS SYSTEM CONTAINING ORGANIC-SOLVENTS

Polyaniline (PAn) with different molecular weight was prepared by addi ng organic solvents such as acetone, ethanol or THF into the polymeriz ation mixture. Open-circuit potential measurements showed that the pol ymerization rate was lowered by the addition of the organic solvent Sp ectral studies showed that PAn intermediate before the oxidant was con sumed was pernigraniline and it was reduced to emeraldine base rapidly by aniline in the termination period. A mechanism of chain propagatio n was proposed. Chain propagation and autoacceleration period were alm ost independent of addition of pernigraniline, and the autoacceleratio n of aniline polymerization is due to more rapid initiation rate. (C) 1998 Published by Elsevier Science S.A. All rights reserved.