INVESTIGATION OF ORDERING IN POLYANILINE SALT FILMS PREPARED FROM HEXAFLUOROISOPROPANOL SOLUTIONS

Hexafluoroisopropanol has proved to be a useful solvent for salts of t he emeraldine form of polyaniline prepared from a number of sulfonic a cids. Large peaks at relatively small X-ray scattering angles establis h the presence of domains containing a periodicity with a spacing in t he 1-3 nm range. The spacings suggest that the emeraldine chains are s eparated by distances equivalent to two anion lengths. The domain size in the direction of periodicity indicate that only 2-4 repeat units a re involved. Neither the X-ray scattering nor results obtained from ne utron reflectometry show evidence for preferential orientation of the domains. (C) 1998 Elsevier Science S.A. All rights reserved.