Surface physicochemistry of corona‐discharge‐treated polypropylene film
作者：Lesley‐Ann O'Hare, Stuart R. Leadley, Bhukan Parbhoo · 发表于：Surface and Interface Analysis · 年份：2002 · DOI：10.1002/sia.1217 · 被引用次数：120 · 研究领域：Surface Modification and Superhydrophobicity、Advanced Sensor and Energy Harvesting Materials、High voltage insulation and dielectric phenomena
Abstract Corona discharge treatment (CDT) is a surface modification technique commonly used to treat plastic films prior to adhesive bonding, printing with inks, lamination to other films and other coating applications. In this study, the treatment conditions are, in energy terms, representative of those used in industrial and laboratory coating applications. The physicochemistry of the surface of untreated and corona‐discharge‐treated biaxially oriented polypropylene (BOPP) film was investigated using a number of complementary surface analytical techniques: contact angle analysis; x‐ray photoelectron spectroscopy (XPS); atomic force microscopy (AFM). This report describes the surface energetics, chemical functionality and morphology of polypropylene film before and after CDT. Both AFM and XPS were utilized, along with washing experiments, to investigate the presence of a weak boundary layer. The surface energy was found, as expected, to increase with increasing energy of the corona. The functional groups incorporated onto the surface have been identified as hydroxyl [C–OH], peroxy [C–O–O], carbonyl [CO], ester [C–O–CO], carboxylic acid [HOCO] and carbonate [OC(O)O]. These groups are present in varying relative concentrations, depending on the energy of the corona utilized. The morphology of the film changed after CDT. Initially, a fibrillar crystalline structure was observed, whereas after CDT a globular morphology became apparent. These globular features were attributed ...