Physicochemical and electrical characterization of polyaniline induced by crosslinking, stretching, and doping

The polyaniline films with various insoluble parts are fabricated. The oxid ation state (1-y) of these polyaniline is 0.53 and 0.54, respectively. To c ontrol the interchain and intrachain interaction of the polymer, the polyan iline films are stretched with appropriate ratio. The insoluble part of pol yaniline synthesized at room temperature (low molecular weight) is 12%-76% and that of polyaniline synthesized at 0 degrees C (intermediate molecular weight) is 65%-89%. The low molecular weight polyaniline films with various drawing ratios have amorphous structure. In the intermediate weight polyan iline films, the crystallinity of films increases with drawing ratio as wel l as insoluble part. The difference of the insoluble pan affects electrical conductivity which is increased dramatically with draw ratio. In particula r, the higher insoluble pan caused greater increase in electrical conductiv ity.