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Influence of atmospheric pressure dielectric barrier discharge on wettability and drying of poly(ether-ether-ketone) foils
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-02-22 , DOI: 10.1016/j.polymdegradstab.2018.02.016
Radka Štefaníková , Tereza Kretková , Anna Kuzminova , Jan Hanuš , Mykhailo Vaidulych , Ondřej Kylián , Hynek Biederman

Wettability and water droplet drying dynamics on poly(ether-ether-ketone) (PEEK) foils treated by atmospheric pressure air dielectric barrier discharge (DBD) has been investigated. It has been found that plasma treatment causes significant increase of PEEK wettability that is predominantly connected with alterations of its chemical composition (oxidation) induced by DBD plasma. The hydrophilization of PEEK surface was not temporally stable and substantial increase of water contact angle up to 67° was observed with increasing storage time, which is consistent with loosening of polar groups as confirmed by means of XPS. Characteristic restoration time of the contact angle was 6.7 days. Furthermore, a large alteration of the dynamics of water droplets drying on PEEK after the plasma treatment was also observed: whereas for untreated PEEK three drying phases were clearly distinguishable, the phase of constant contact angle disappeared in the case of PEEK exposed to the atmospheric pressure air plasma. In spite of substantial decrease of PEEK wettability with storage time the constant angle phase didn't appear within 51 days after the plasma treatment. As a result of this plasma treated and aged PEEK exhibits much higher water contact hysteresis as compared to untreated PEEK. This effect may be explained by the formation of randomly distributed nanostructures on PEEK surface exposed to DBD plasma that increase the spatial heterogeneity of the PEEK surface and enhance droplet pinning during its drying.



中文翻译:

大气压介质阻挡放电对聚醚醚酮箔润湿性和干燥性的影响

研究了大气压空气介质阻挡放电(DBD)处理的聚(醚-醚-酮)(PEEK)箔上的润湿性和水滴干燥动力学。已经发现,等离子体处理引起PEEK润湿性的显着提高,这主要与DBD等离子体引起的其化学组成的改变(氧化)有关。PEEK表面的亲水性在时间上不稳定,并且随着储存时间的增加,观察到水接触角最大增加至67°,这与通过XPS证实的极性基团的松散相一致。接触角的特征恢复时间为6.7天。此外,还观察到等离子处理后在PEEK上干燥的水滴动态变化很大:而对于未处理的PEEK,三个干燥阶段是明显可区分的,在PEEK暴露于大气压空气等离子体的情况下,恒定接触角阶段消失了。尽管PEEK润湿性随储存时间而大大降低,但等离子处理后的51天之内没有出现恒定角相。与未处理的PEEK相比,这种经过等离子体处理和老化的PEEK表现出更高的水接触滞后。可以通过在暴露于DBD等离子体的PEEK表面上形成随机分布的纳米结构来解释这种效果,该结构会增加PEEK表面的空间异质性并增强其干燥过程中的液滴固定。尽管PEEK润湿性随储存时间而大大降低,但等离子处理后的51天之内没有出现恒定角相。与未处理的PEEK相比,这种经过等离子体处理和老化的PEEK表现出更高的水接触滞后。可以通过在暴露于DBD等离子体的PEEK表面上形成随机分布的纳米结构来解释这种效果,该结构会增加PEEK表面的空间异质性并增强其干燥过程中的液滴固定。尽管PEEK润湿性随储存时间而大大降低,但等离子处理后的51天之内没有出现恒定角相。与未处理的PEEK相比,这种经过等离子体处理和老化的PEEK表现出更高的水接触滞后。可以通过在暴露于DBD等离子体的PEEK表面上形成随机分布的纳米结构来解释这种效果,该结构会增加PEEK表面的空间异质性并增强其干燥过程中的液滴固定。

更新日期:2018-02-22
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