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Hydrophobic Prediction Model and Experimental Study of PMMA Surface Microstructure Prepared by Femtosecond Laser Direct Writing

In this paper, a femtosecond laser removal model of PMMA was built, and the surface primary and secondary microstructures of PMMA were fabricated. The surface morphology and wettability of the microstructures were measured and analyzed by an ultra-depth three-dimensional microscope and a contact angle measuring instrument. The results showed that femtosecond laser direct writing processing of PMMA surface microstructure changed the PMMA wettability from a hydrophilic state to a hydrophobic state. Meanwhile, the size parameters of multistage microstructures on the PMMA surface were optimized, according to numerical simulation. The contact angle of the optimized microstructures could exceed 150°, achieving superhydrophobicity of the PMMA surface.