Enhanced Swelling Behaviors of Polypyrrole Film Doped with Sulfonated Polyaniline

Polypyrrole (PPyDBS/PMAS) films partially doped with poly(2-methoxyaniline-5-sulfonate) (PMAS) have been deposited in dodecylbenzene sulfonic acid solutions. Both of the conductivity and water content of the film were found to show the strong dependence of PMAS contents, indicating that the PMAS was clearly incorporated and strongly affects the film characteristics. The obvious increase of cathodic expansion (4.5% in expansive strain) for PPyDBS/PMAS (5%) film elucidates that the PMAS additive contributes to improve the cathodic expansion, which can be attributed to the increased swelling capability of PPy with PMAS incorporation.