STUDY ON POLYANILINE FILM WITH HIGH DENSITY AND HIGH MECHANICAL STRENGTH

Free-standing film of polyaniline with excellent mechanical and electrical properties has been successfully prepared by using the solution-casting method. The results show that its tensile strength, Young’s modulus and elongation at break are about 87.9 MPa, 1563.9 MPa and 10.2%, respectively. It is essential that the soluble polyaniline should be appropriately treated in some suitable organic solvents before making a free-standing film. Films having lustrous, smooth surface, high density and good flexibility can only be doped by protonic acids of small molecular sizes, such as HCl, HClOand HSO, to the metallic conducting regime （σ=6.7 S/cm）. Discussions have been made in terms of doping behavior essentially affecting drawability and mechanical strengths.