Electrochemical Behaviour of Conducting Polymer/Polyimide Composite

Two types of conducting polymer composites comprising polypyrrole (PPy) (filler) dispersed in a polyimide (PI) (matrix) and bilayered conducting polymer/PI composites, were successfully formulated. Electrochemical deposition of the PPy/PI composite was accomplished by initially depositing PPy onto the working electrode, and then casting a layer of PI onto the modified electrode. The PPy/PI composite was also formulated by first casting a PI film onto the bare electrode followed by electrochemical deposition of PPy. Poly(N-ethylaniline)/PI composites were prepared by initially depositing a thin layer of poly(N-ethylaniline) onto the substrate (AA 2024-T3) and then casting a layer of PI resin onto the modified substrate. The composite coatings were characterised by advanced analytical techniques, such as reflection absorption infrared spectroscopy (RAIR), SEM, dc polarisation studies and electrochemical impedance spectroscopy. SE/S275