Filtern
Dokumenttyp
- Zeitschriftenartikel (1)
- Buchkapitel (1)
Sprache
- Englisch (2)
Schlagworte
- Surface modification (2) (entfernen)
Three polyethylene (PE) types with different branching structures were subjected to air, water and ethanol aerosol-assisted dielectric barrier discharges (DBD) for surface modification. Using the air DBD the incorporated oxygen concentration was found to be independent on the branching of PE in contrast to the introduction of OH groups, which was PE-2 > PE-1 > PE-3. For water-aerosol DBD the succession of OH concentration was in the order of PE-1 > PE-2 > PE-3. Ethanol aerosol-assisted DBD produced the lowest concentration of OH groups also independent on the branching of PE. The chemical nature of introduced oxygen functional groups was inspected by X-ray photoelectron spectroscopy (XPS) and assigned as C–O, >C=O/CHO/O–C–O and O=C–O.
A convenient way to overcome the chemical inertness of polyolefin surfaces is to expose them to the atmospheric air plasma of a dielectric barrier discharge (DBD). To improve the efficiency in formation of polar groups at the polyolefin surface, different liquids such as water and ethanol were sprayed as aerosol into the plasma zone between the powered electrode and the polyolefin surface. Both sprayed liquids as well as the polyolefin surface were simultaneously activated; thus, the formation of different functional groups at the polyolefin surface was realized. The type of aerosol-sprayed additive, exposure time, power etc. have been found to determine the efficiency with respect to introduction of polar groups.