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Effects of femtosecond laser micromachining on the surface and substrate properties of Poly-lactic acid (PLA)
Applied Surface Science ( IF 6.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.apsusc.2020.148117
Guangchao Ye , Wei Wang , Dapeng Fan , Ping He

Abstract The effects of femtosecond laser ablation on the surface morphology, surface chemical composition, and matrix properties of poly-lactic acid (PLA) were explored in this paper, since the analysis of the different energy density range is crucial in evaluating to what extent material properties change during the micromachining. Scanning electron microscopy (SEM) analysis found that different surface microstructures, i.e., the convex microstructure and the through hole, were generated by single and multiple pulses femtosecond laser ablations, respectively. The photo-thermal features appeared on the PLA surface displayed a dependence on the femtosecond laser pulse number or fluence. The surface affected by femtosecond laser ablation was also analyzed using Fourier transforms infrared (FTIR) as well as X-ray photoelectron spectroscopy (XPS), which indicated that an oxidation reaction had occurred during the micromachining. The ablation of PLA surface resulted in a decreased molecular weight and an increase of polydispersity, which was consistent with a drop in transition temperature (Tm). Therefore, the substrate also degraded although the micromachining process was only performed on the surface. The variation in PLA surface microstructures, chemistry, and matrix performance resulted from different laser parameters were related to the laser-matter interaction effects.

中文翻译:

飞秒激光微加工对聚乳酸(PLA)表面和基材性能的影响

摘要 本文探讨了飞秒激光烧蚀对聚乳酸 (PLA) 表面形貌、表面化学成分和基体性质的影响,因为对不同能量密度范围的分析对于评估材料达到何种程度至关重要。在微加工过程中性能会发生变化。扫描电子显微镜(SEM)分析发现,不同的表面微结构,即凸微结构和通孔,分别由单脉冲和多脉冲飞秒激光烧蚀产生。PLA 表面上出现的光热特征显示出对飞秒激光脉冲数或能量密度的依赖性。还使用傅里叶变换红外 (FTIR) 和 X 射线光电子能谱 (XPS) 分析了受飞秒激光烧蚀影响的表面,这表明在微加工过程中发生了氧化反应。PLA 表面的烧蚀导致分子量降低和多分散性增加,这与转变温度 (Tm) 的下降一致。因此,尽管仅在表面进行了微机械加工,但基板也会退化。由不同激光参数引起的 PLA 表面微结构、化学和基体性能的变化与激光-物质相互作用效应有关。尽管微机械加工仅在表面上进行,但基材也会退化。由不同激光参数引起的 PLA 表面微结构、化学和基体性能的变化与激光-物质相互作用效应有关。尽管微机械加工仅在表面上进行,但基材也会退化。由不同激光参数引起的 PLA 表面微结构、化学和基体性能的变化与激光-物质相互作用效应有关。
更新日期:2021-02-01
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