The processing of polyaniline has been hampered by the gelation of solutions of the emeraldine base form in N-methyl-2-pyrrolidinone (NMP) and N,N'-dimethyl propylene urea (DMPU). It was recently reported that fibers and films prepared from solutions of the leucoemeraldine base form of polyaniline in DMPU exhibited an endotherm characteristic of crystalline melting. In the present study, thermal analysis by differential scanning calorimetry is employed to investigate the influence of the oxidation state on development of the crystalline structure in polyaniline. In addition, preliminary results are presented that begin to show how experimental methods (such as FTIR transmission and bulk electrolysis) for determination of oxidation state may be affected by sample characteristics (i.e. morphology).
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