In this communication, we report for the first time the synthesis of a new electroactive poly(aryl ether ketone) derived from the phenylcapped aniline tetramer. The general properties are studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The polymer has high serving temperature and good thermal stability. And its chemical oxidation process was studied by UV-Vis spectra. It was found the polymer was oxidized to its EB form and then to the pernigraniline oxidation state, which is same as the PANI. (c) 2005 Elsevier Ltd. All rights reserved.