Polarized Raman Spectroscopy Strategy for Molecular Orientation of Polymeric Fibers with Raman Tensors Deviating from the Molecular Frame,ACS Applied Polymer Materials

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Polarized Raman Spectroscopy Strategy for Molecular Orientation of Polymeric Fibers with Raman Tensors Deviating from the Molecular Frame
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-09-24 , DOI: 10.1021/acsapm.0c00762
Leo Svenningsson ₁ , Lars Nordstierna _{1,

2}

Affiliation

Polarized light is frequently used to identify molecular anisotropy in polymers, biological systems, and other materials. The influence of the Raman tensor by polarized light reveals not only the chemical structure but also information on the morphology of polymers. The orientation distribution of molecules in polymers has previously been determined for systems with the principal axis components of the Raman tensor parallel to the molecular frame. In many cases, the Raman tensor principal axis is not parallel to the molecular chain axis. Therefore, the orientation of the Raman tensor, relative to the molecular chain axis, is crucial if accurate information about the molecular orientation distribution is sought for. This work presents a strategy for separating the Raman tensor orientation angles from the molecular orientation angles for polymeric samples with fiber symmetry. Composite polymeric materials often experience signal overlap in the X-ray scattering wide-angle region, where the anisotropy is often resolved. While X-ray scattering investigates intermolecular distances, Raman spectroscopy resolves chemical information, and anisotropy, by the influence of Raman scattering. The quantitative principles presented here may aid in the evaluation of anisotropy in such composite materials.

中文翻译：

偏振拉曼光谱策略用于拉曼张量偏离分子框架的聚合物纤维的分子取向

偏振光通常用于识别聚合物，生物系统和其他材料中的分子各向异性。偏振光对拉曼张量的影响不仅揭示了化学结构，而且揭示了聚合物的形态信息。先前已针对拉曼张量的主轴分量与分子框架平行的系统确定了聚合物中分子的取向分布。在许多情况下，拉曼张量主轴不平行于分子链轴。因此，如果要寻找有关分子取向分布的准确信息，拉曼张量相对于分子链轴的取向至关重要。这项工作提出了一种策略，用于将具有纤维对称性的聚合物样品的拉曼张量取向角与分子取向角分开。复合聚合物材料经常会在X射线散射广角区域经历信号重叠，在该区域中各向异性通常会得到解决。当X射线散射研究分子间距离时，拉曼光谱通过拉曼散射的影响解析化学信息和各向异性。此处介绍的定量原理可能有助于评估此类复合材料中的各向异性。拉曼光谱通过拉曼散射的影响解析化学信息和各向异性。此处介绍的定量原理可能有助于评估此类复合材料中的各向异性。拉曼光谱通过拉曼散射的影响解析化学信息和各向异性。此处介绍的定量原理可能有助于评估此类复合材料中的各向异性。

更新日期：2020-11-13

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