Experimental study on surface modification of PET films under bipolar nanosecond-pulse dielectric barrier discharge in atmospheric air
Autor: | Wenwu Zhou, Chuan Fan, Feng Wang, Weidong Ding, Yunfei Liu, Chunqiang Su, Xiang Ren |
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Rok vydání: | 2014 |
Předmět: |
Materials science
Scanning electron microscope Analytical chemistry General Physics and Astronomy Relative permittivity Surfaces and Interfaces General Chemistry Dielectric barrier discharge Dielectric Dielectric withstand test Condensed Matter Physics Surfaces Coatings and Films X-ray photoelectron spectroscopy Surface modification Dielectric loss Composite material |
Zdroj: | Applied Surface Science. 313:53-59 |
ISSN: | 0169-4332 |
DOI: | 10.1016/j.apsusc.2014.05.129 |
Popis: | Dielectric barrier discharge (DBD) is widely used for surface modification of polymer films. In this paper, DBD characteristics under bipolar repetitive frequency nanosecond pulse in atmospheric air are studied and surface properties of polyethylene terephthalate films under homogeneous DBD and filamentary DBD modification are compared through scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and dielectric test equipment. It is found that the discharge is homogeneous when gap spacing d is less than 1.2 mm and filamentary when d is within the range of 3.0 mm to 5.8 mm. SEM pictures reveal that films under homogeneous DBD present a smooth surface while intensive “gully-like” etches appear on the surface of the films under filamentary DBD, which can result in local insulation defects and is disadvantageous to surface modification. It is found from the XPS analysis that a number of oxygen-containing polar groups are introduced onto the surface of the film modified by homogeneous DBD compared with the untreated one. Experimental results for dielectric properties indicate that the three parameters: relative dielectric constant ɛr, dielectric loss tangent tan δ and breakdown voltages Vb are all changed in different degree after surface modification. And possible reason for the phenomenon is discussed. |
Databáze: | OpenAIRE |
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