Controlling Wettability of the Each Side of the PLA Fabric through Orientation of the Working Gases (O2 and CH4) During Cold Plasma Treatment

This study aimed to obtain a bifunctional fabric from the point of view of hydrophilicity/hydrophobicity for biomedical applications. To achieve this, both sides of a fabric of polylactic acid (PLA) were subjected to a plasma treatment. While in a side the oxygen was introduced to the other side, simultaneously, was added methane. The plasma treatment was performed at 100 W, 1.8 mbar, during 30 minutes. By Scanning Electron Microscopy (SEM) morphological analysis, it became evident that the fabric side facing the oxygen inlet showed micropittings, while the reverse side had smooth surfaces. Analysis by X-Ray photoelectron spectroscopy (XPS) revealed an increase in the amount of oxygen in the surface of the PLA on both sides of the fabric. The surface function was characterized by measurements of water absorption rate, where it was determined that one fabric side was more hydrophilic than the other side. The results indicated achievement of a bifunctional fabric through orientation of working gases during a plasma treatment.

本研究旨在从亲疏水性角度出发，制备可应用于生物医学领域的双功能织物。为达成该目标，对聚乳酸（polylactic acid, PLA）织物的两侧均实施等离子体处理：处理过程中，织物一侧通入氧气，另一侧同步通入甲烷。等离子体处理参数设定为100 W功率、1.8 mbar压强，处理时长30分钟。通过扫描电子显微镜（Scanning Electron Microscopy, SEM）形貌分析可知，朝向氧气入口的织物一侧出现了微孔凹陷，而另一侧表面较为平整光滑。通过X射线光电子能谱（X-Ray photoelectron spectroscopy, XPS）分析发现，织物两侧的PLA表面氧元素含量均有所提升。通过吸水率测试对织物表面性能进行表征，结果表明织物两侧的亲水性存在差异，其中一侧亲水性显著强于另一侧。研究结果证实，通过调控等离子体处理过程中的工作气体通入方向，可成功制备得到双功能织物。