Surface oxygenation of polypropylene using an air dielectric barrier discharge: the effect of different electrode–platen combinations

Polypropylene film has been modified in an air dielectric barrier discharge using two different electrode–platen configurations: stainless steel wire electrode–rubber platen or ceramic electrode–aluminium platen combinations. Modified films were characterised by static contact angle measurements, X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS) and Fourier transform infrared spectroscopy (ATR–FT-IR). Surface hydrophilic modification appears to be governed by the presence of low-molecular weight oxidised functionalities using XPS and SIMS techniques. Irrespective of the type of electrode–platen combination used to obtain the discharge, oxygenated functionalities of identical nature are formed on the polymer surface. However, the degree of oxidation obtained by the discharge using the wire electrodes with the rubber platen was considerably greater. Further increase in the observed hydrophilicity due to molecular rearrangement and development of stable oxygenated functionalities was evident after 1 month of post-processing analysis. # 2004 Elsevier B.V. All rights reserved.