Surface Modification And Etching Of Polymer By Excimer Laser Irradiation

Since American physicist T.H.Maiman succeeded in researching the first laser in 1960, the interaction between laser and material has been an important and interesting subject. In material science, the high molecular polymers are rather concerned by material scientists because of the fine characteristic and wide application in national produce. It is a kind of new surface processing technology utilizing excimer laser to treat the surface of the polymer materials, which has been developed in the past 20 years. Excimer laser is gas laser which was developed in the 70s of the 20th. Its energy is high and it has long performance life, the working wavelength is in the purple. The wavelength range can be absorbed by a lot of high molecular polymers. The surface modification of the high molecular polymer material was reported in 1982 for the first time which is named laser ablation at that time. From then on, people gradually pay attention to the surface modification and etching of polymer by excimer laser irradiation. In this paper, we utilized 248nm excimer laser irradiates the surface of two kinds of high polymer materials, and investigated the changes of the surface appearance, the chemical composition and physics property with X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman spectroscopy etc. we analyze particularly the internal mechanism of interaction between the laser and two polymers and provide the rational explanation. The analysis to the polytetrafluoroethylene (PTFE) are concentrated mainly on the changes of surface physical property and chemical constitution of PTFE after laser irradiation, and we further discussed the likely influence on the improving of the PTFE surface performance . Polytetrafluoroethyene(PTFE) has many valuable properties, including low dielectric constant, high resistivity, high thermal and chemical stability, low coefficient of friction, potential biocompatibility and low surface energy, e.g.. This combination of properties makes PTFE a material of interest for numerous...