Spatially-resolved crystallinity determination of polymer welding seams by Raman-microscopy

In polymer laser transmission welding (LTW) the process parameters affect the weld seam crystallinity, which impacts mechanical, optical and chemical properties of the weld seam material. However, correlations between process parameters and these material properties are still under investigation. To improve the necessary understanding, spatially resolved crystallinity measurements by Raman microscopic mapping offer valuable insights. This paper demonstrates an advanced spectroscopic evaluation method capable of resolving crystallinity distributions even within the absorbing joining partner. Besides the description of the utilized self-developed Raman microscope, the main focus is put on the mathematical spectral reconstruction by multiple Voigt functions used to calculate the crystallinity. [All rights reserved Elsevier].

在聚合物激光透射焊接（LTW）中，工艺参数会影响焊缝的结晶度，进而影响焊缝材料的机械、光学和化学性能。然而，工艺参数与这些材料性能之间的相关性仍在研究之中。为了增进必要的了解，通过拉曼显微成像进行空间分辨的结晶度测量提供了有价值的见解。本文展示了一种先进的光谱评估方法，该方法即使在吸收性连接部件内部也能够解析结晶度分布。除了对所使用的自行研发的拉曼显微镜的描述外，主要重点放在通过用于计算结晶度的多个沃伊特函数进行的数学光谱重建上。[版权所有©爱思唯尔]