X-RAY-SCATTERING STUDY OF CSA PROTONATED POLYANILINE FILMS AND POWDERS

An X-ray scattering study was carried out on camphorsulfonic acid-prot onated emeraldine base samples in water, m-cresol and in their mixture s. The X-ray profiles strongly depend on the protonation conditions an d on the molecular weight of the emeraldine base (EB). The protonation of the EB in solution in m-cresol enables a better crystallization th an inside the EB powder suspended in aqueous acidic solution. X-ray pr ofiles evolved when protonated EB m-cresol-free samples were exposed t o m-cresol vapors, indicating that m-cresol enhances the crystallinity and the structural order. All different X-ray profiles of the films c ould be indexed with a sole orthorhombic cell with a = 21.5 Angstrom, b = (2x) 3.5 Angstrom and c = 18.6 Angstrom.