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|Title:||Charge transfer interactions and redox states in ring-substituted polyanilines and their complexes|
|Authors:||Kang, E.T. |
|Citation:||Kang, E.T.,Neoh, K.G.,Tan, K.L. (1994). Charge transfer interactions and redox states in ring-substituted polyanilines and their complexes. European Polymer Journal 30 (4) : 529-535. ScholarBank@NUS Repository.|
|Abstract:||Oxidative chemical polymerizations of halogen and alkyl ring-substituted aniline in aqueous acids and organic solvent media have been carried out. X-ray photoelectron spectroscopic data suggest that, with the exception of 2-chloroaniline polymer prepared in an aprotic solvent, the ring-substituted aniline polymers generally have a lower intrinsic oxidation state (imine/amine ratio) than that of their unsubstituted emeraldine counterpart. Nevertheless, protonation levels close to 50% are readily achieved when the 2-chloroaniline, 3-chloroaniline and 2-ethylaniline base polymers are loaded with excess non-volatile HCIO4. Sulfonation of the ring-substituted polymer readily gives rise to a self-protonated polymer. The extent of sulfonation, however, is limited by the substituent at the ortho-position of the ring. The halogen substituent at the ortho-position is more susceptible to elimination than that at the meta-position during reprotonation and sulfonation. The ring substituent also severely hinders the charge transfer interactions of the polymer with bulky organic acceptors, such as o-chloranil and σ-bromanil. © 1994.|
|Source Title:||European Polymer Journal|
|Appears in Collections:||Staff Publications|
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