【摘要】 利用波长为248 nm的准分子激光束在不同激光能量密度下照射聚四氟乙烯(PTFE)材料的表面,并用扫描电镜(SEM)、X射线光电子能谱(XPS)、拉曼(Raman)光谱等手段对激光处理前后样品的表面形貌、化学成分和结构进行测量和分析,进而对激光与聚四氟乙烯相互作用的机理进行了研究。实验结果表明,激光辐照使聚四氟乙烯表面产生去氟效应,导致表面碳化、分子链的交联以及含氧基团的产生,随着激光能量密度的增加,C=C双键逐渐形成。这些结构的变化可以导致表面硬度和粘结性增强。激光能量密度的大小对照射后样品表面的物理性质和化学结构有着重要的影响,它是聚合物表面激光改性和烧蚀的关键因素。更多还原

【Abstract】 The surface of polytetrafluoroethylene(PTFE) is modified by the irradiation from a focused excimer laser with wavelength of 248 nm with different energy densities.Scanning electron microscopy,X-ray photoelectron spectroscopy and Raman spectroscopy are used to investigate the changes of the surface morphology,chemical composition and structure.The mechanism of interaction between laser and PTFE is further studied.The experimental results indicate that the component of fluorin reduces greatly after laser irradiation and there appear the carbonization of the surface,cross-linking and the formation of oxygen function group.When the laser energy density is increased,C=C bond is produced.These changes of structure can enhance the hardness and adhesion of the surface.The physical properties and chemical structure of the treated samples surface are influenced greatly by the laser energy density,which is an important factor in the process of laser modification and ablation.更多还原