Advances in the Raman Depth Profiling of Polymer Laminates
Advances in the Raman Depth Profiling of Polymer Laminates
复制标题
聚合物层压板拉曼深度分析的进展
作者：
C. Froud;I. Hayward;J. Laven
利用拉曼显微光谱技术对多层聚合物层压板进行深度剖分是越来越受欢迎的。然而，由于空气/样品界面折射率的变化，结果通常会受到像差的影响。最近的研究表明，使用浸泡油和合适的物镜可以减少这种影响。本研究通过比较干式冶金物镜和浸没物镜（与适当折射率的油结合使用）对多层聚（苯乙烯）/聚（甲基丙烯酸甲酯）（PS/PMMA）层压聚合物的深度剖面结果来评估这一建议。浸没技术能够成功地对物镜的整个工作距离（100 μm）进行深度分析，显示出层压片内11个不同层的清晰变化；用于比较的干式冶金物镜只有两层的较差分辨率。这是首次在聚合物层压板内进行深度剖面分析。将深度剖面结果与PS/PMMA样品在树脂中固化后切片得到的结果进行比较。
The use of Raman microspectroscopy to depth profile multi-layered polymer laminates is becoming increasingly popular. However, the results are generally degraded by aberrations introduced by the change in refractive index at the air/sample interface. Recent research has suggested that the use of an immersion oil and suitable objective can reduce this effect. This study evaluates this proposal by comparing depth profiling results on a multi-layer poly(styrene)/poly(methylmethacrylate) (PS/PMMA) laminate polymer from both dry metallurgical objectives and immersion objectives (used in combination with an oil of suitable refractive index). The immersion technique enabled successful depth profiling to the full working distance of the objective (100 μm), showing clear and distinct variations in 11 different layers within the laminate; a dry metallurgical objective used for comparison achieved poor resolution of only two layers. This is the first demonstration of depth profiling within a polymer laminate to this depth. The depth profiling results are compared to results obtained by sectioning the PS/PMMA sample after setting it in resin.