The present work is concerned with preparation and characterization of conducting composite membranes and degradation studies in dry atmosphere, water and other environments similar to practical application media. Improvement of the stability, mainly by incorporation of sulfonic stabilizer is another aspect of this work. This work has focused upon chemical oxidation to form the conducting polymers onto host membranes. Development of preferred preparation conditions involves a factorial orthogonal approach, where conductivity and water flux data are pooled from the results of three variables (temperature, concentration and time) at three levels. Morphological changes of membranes surface and cross-section before and after treatment is undertaken using field emission scanning electron microscopy. Chemical structure changes upon degradation in different media is studied by X-ray photoelectron spectroscopy. These studies demonstrate that the incorporation of sulfonate dopants can improve the environmental stability of these membranes by modifying their chemical structure.