为了对片状聚氨酯进行表面修饰, 促进细胞在其上的粘附, 对使用波长为532 nm的脉冲固体激光器在片状聚氨酯上打孔的工艺参数进行了研究。主要研究了激光能量、激光作用时间、脉冲个数以及离焦量对打孔效果的影响。结果表明, 随着激光能量的升高、激光作用时间的延长以及脉冲个数的增加, 孔径和孔深均会随之增加。焦点的降低和进入聚氨酯深度的增加, 会导致孔的锥度增加。所打微孔大小均匀, 圆度好, 无毛边、锯齿。波长为532 nm的激光主要通过光热作用对聚氨酯进行消解。

To modify the surface and cell adhesion ability of polyurethane In this research, laser drilling of holes in polyurethane was constructed by adopting a 532 nm pulsed Nd∶YAG laser. The effect of laser energy, laser irradiation time, number of pulses and laser focal point on the resulting holes were investigated. The results revealed that the increase of laser energy, laser irradiation time and number of pulses will lead to the increase of diameter and depth of the holes. Besides, the effect of tapering of holes increases with the focal point going lower or deeper into the polyurethane. The resulting holes have uniform size and good roundness. The interaction mechanism between laser beams and polyurethane is photothermal ablation.