飞秒激光制备PMMA表面微结构的作用机理和润湿性研究

采用飞秒激光微加工技术对聚甲基丙烯酸甲酯(PMMA)表面进行微加工,研究PMMA表面不同微结构的润湿性。首先对飞秒激光去除透明聚合物材料的机理进行研究并建立了材料去除模型,制备出PMMA表面光栅结构和方柱结构；采用超景深三维显微镜和接触角测量仪对微结构表面形貌和润湿性进行测量分析。结果表明:飞秒激光加工PMMA表面微结构可以将PMMA润湿性从亲水向疏水状态转变,微结构间距过小会导致激光加工时飞溅的熔融物堆积在结构通道。

Study on the mechanism and wettability of PMMA surface microstructure prepared by femtosecond laser

In this paper,femtosecond laser micromachining technology was used to study the wettability of different microstructures on the surface of PMMA.Firstly,the mechanism of transparent polymer material removal by femtosecond laser was studied and the material removal model was established,and the surface grating structure and square column structure of PMMA were prepared.The surface morphology and wettability of the microstructure were measured and analyzed by the ultra depth of field three-dimensional microscope and contact angle measuring instrument.The results show that the wettability of PMMA can be changed from hydrophilic state to hydrophobic state by femtosecond laser processing of the surface microstructure of PMMA,and the small spacing of the microstructure will lead to the accumulation of splashed molten materials in the structure channel during laser processing.