COMPARATIVE AGING OF 3 ELECTROCONDUCTIVE POLYMERS

We compared ageing resistance of polypyrrole (PPY), polyaniline (PANI) and polyethylene dioxithiophene (PEDT) samples, protected or not by a n oxygene barrier vinylydene polychloride layer (PVDC), by recording t he variations of their respective electrical conductivity. A first 550 hours at 100 degrees C ageing test allows us to choose the most effic ient formulation of PVDC. Selected samples have been aged at 70 degree s C. After 1300 hours of ageing, protected PEDT's sample electrical co nductivity was 98 % of its initial value, whereas PPY's was 75% and PA NI's 50%. The same differences have been found for the non protected m aterials.