Abstract
In this study, we report on the investigation of influence of air atmospheric pressure dielectric barrier discharge on polyimide (Kapton) films. It is shown that plasma treatment causes a significant increase of Kapton wettability that is connected with alterations of its chemical composition (oxidation) induced by dielectric barrier discharge. Observed variations in the wettability of Kapton were also found to be accompanied by changes in the dynamics of water droplets drying on plasma-treated Kapton, namely by the reduction of the constant contact angle phase of the droplet drying. This effect may be ascribed to the higher surface heterogeneity of plasma-treated Kapton that causes pinning of the edges of drying droplet on the Kapton surface. Finally, the differences in wettability induced by the plasma treatment led to a different way, how the water condensates on the Kapton surface: while the condensing water forms large amount of small droplets on untreated Kapton, much bigger water structures were found on the Kapton exposed to atmospheric plasma.
Highlights
Kapton, which is a polyimide material developed by the Du Pont company in the 1960s is one of the high-performance polymers that exhibits remarkable properties.This makes Kapton a highly valuable and popular material in a wide range of modern technologies that include, for instance, flexible electronics, optoelectronics and spintronic or aircraft and aerospace industries [8,9]
Various strategies were developed with an aim to reduce inherent surface hydrophobicity, insufficient adhesion and/or inertness of Kapton to comply with demands in various applications that are based on the utilization of protection/adhesion layers, chemical treatment, ion beams or ultra-violet radiation [10,11,12,13,14,15,16]
The O/C ratio was found to increase by 50% from 0.2 measured on untreated Kapton up to 0.32 on Kapton exposed to the dielectric barrier discharges (DBD) plasma for
Summary
230 MPa, good dielectric properties with dielectric constant 3.4 and low-outgassing in a vacuum) This makes Kapton a highly valuable and popular material in a wide range of modern technologies that include, for instance, flexible electronics, optoelectronics and spintronic (e.g., electronic skin applications, flexible sensors, or solar cells [1,2,3,4,5,6,7]) or aircraft and aerospace industries [8,9]. As an analogy to other polymers, an interesting alternative to the aforementioned approaches represents plasma-based techniques The popularity of these methods is connected with the fact that they are capable, under appropriate conditions, to modify surfaces of a treated object without the alteration of its bulk characteristics
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