Procedure for insoluble polymers. Hydrochloric and sulfuric acids of 0.1N, (0.5N,1Nor 2N) was added to polymer powder in proportion 100 ml to 1 g. The mixture was kept at room temperature
for 5–6 days. Then precipitate was filtered and washed with ethyl alcohol till neutral reaction and dried under vacuum (0.2 kPa) in a desiccator with P2O5. Dopant content in polymers was determined via filtrate titration with 0.2N NaOH aqueous solution.