ABSTRACT
The conductivity of doped polyaniline in the emeraldine oxidation state is shown to initially increase with increasing molecular weight and then to remain relatively constant. The processing of the polymer into uniaxially oriented films and fibers and into biaxially oriented films is discussed. The conductivity of uniaxially stretched films and fibers, the apparent degree of crystallinity and the tensile strength of the polymer are shown to increase significantly with the extent to which it is mechanically stretch-oriented. A "self" protonic acid doped form of polyaniline and an interpenetrating polymer network system involving polyaniline, both of which show greatly enhanced conductivity at pH values where doped polyaniline has negligible conductivity are described. Two completely different methods are reported for synthesizing polyaniline in its highest (pernigraniline) oxidation state.
