Highly Conducting And Thermally Stable Conjugated Polymers
A series of highly conductive, environmentally and thermally stable polyanilines was synthesized. These polymers, which are obtained by employing careful synthetic conditions, purification procedures, and dopant variations, show interesting morphological structures and high temperature stability. Thermal studies by TGA, DSC and DMTA show a glass transition temperature (Tg) for neutral polyaniline around 185°C. This is the same temperature at which the conductivity and crystallinity decrease. Isothermal heatings of the polyaniline tosylate at 200 and 250°C in air show significant amounts of weight loss. This is due to dopant loss through irreversible chain rearrangements and air oxidation at temperatures above Tg.