脉冲紫外激光和脉冲红外光纤激光表面改性对聚苯硫醚表面化学成分的影响

Effects of Pulsed Ultraviolet Laser and Pulsed Infrared Fiber Laser Surface Modification on Chemical Composition of Polyphenylene Sulfide Surface

目的改善聚苯硫醚(PPS)表面的润湿性和吸附性等相关性能。方法选择了两种常用的激光器,即波长为355 nm的脉冲紫外激光和波长为1064 nm的脉冲红外光纤激光,在空气中对PPS进行了表面改性研究,探讨了两种激光的能量密度对改性后PPS表面化学成分的影响。结果两种激光在一定能量密度下对PPS进行表面改性后,X射线光电子能谱法(XPS)能检测到如C=O、COO—、C—O、—SO、—SO_2、—SO_4等新基团,这可能是由于改性时PPS表面发生了化学键断裂,并与空气中的含氧物种反应生成了新基团。此外还发现,两种激光作用后的PPS表面,化学成分相对含量的变化程度均随能量密度的增加而增加,但由于两种激光与PPS相互作用的方式不同,导致相同能量密度下,脉冲紫外激光作用后的PPS表面化学成分的变化程度比脉冲红外光纤激光作用后的PPS表面更大。结论脉冲紫外激光和脉冲红外光纤激光在一定能量密度下改性PPS表面,均能使其表面的化学成分发生变化。

The work aims to improve surface wettability and adsorbability of polyphenylene sulfide （PPS）. Two commonly lasers, i.e., 355 nm （wavelength） pulsed ultraviolet （UV） laser and 1064 nm （wavelength） pulsed infrared （IR） fiber laser, were used to modify PPS surface. The effects of laser energy density on chemical composition of modified PPS surface were discussed. After PPS was modified by the two lasers under certain energy density, new groups such as C=O, COO-, -SO, -SO2 and -SO4 were detected in the method of X-ray photoelectron spectroscopy （XPS）, this was probably since chemical bond ruptured and reacted with oxygen-containing species in the air. It was also found that relative content variation degree of chemical composition on the modified PPS surfaces increased with energy density. However, interaction mechanisms between the two lasers and PPS were different, hence variation degree of chemical composition on the PPS surface modified by pulsed UV laser was higher than that on the PPS surface modified by pulsed IR fiber laser under the same energy density. Chemical composition of PPS surfaces will change after surface modification by pulsed UV laser and pulsed IR fiber laser under certain energy density.