Viscoelastic properties and structure of the zone-drawn polyaniline films

The zone-drawing method was applied to chemically synthesized polyaniline c ast films of emeraldine base under various applied tensions and drawing tem peratures. The changes in the microstructure and viscoelastic properties of the resulting films were investigated. It was found. that, the microstruct ure was strongly affected by the drawing temperature (T-d). The crystallini ty, crystallite size, and orientation factor of crystallites, respectively, attained 42%, 23 Angstrom, and 0.975 for the film zone-drawn at T-d = 170 degrees C, whereas a further increase in the T-d brought about a decrease o f these values. The viscoelastic measurements indicated that the dynamic st orage modulus attained 12 GPa at room temperature and was 5 GPa at 280 degr ees C for the film zone-drawn at T-d = 210 degrees C, which was comparable to that of the typical engineering plastics. (C) 2000 John Wiley & Sons, In c.