Abstract The degree of crystallinity in polymer materials significantly affects their physical properties. However, the distribution of the degree of crystallinity within polymer materials has not been considered even though it should, equally importantly, affect the properties. Herein, we investigate how the degree of crystallinity is spatially distributed in poly(e-caprolactone) (PCL) films utilizing Raman spectrum. The results indicate that the degree of crystallinity is not uniform throughout the films but presents a distribution along the radial direction of spherulite, with lower degree of crystallinity in the spherulite center. Consequently, the melting range exhibits a similar spatial distribution, with the spherulite center starts to melt at a lower temperature. This work begins to provide an additional structural feature of crystalline polymers that should greatly affect the polymer properties.

中文翻译：

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显示聚合物薄膜空间分布的结晶度

摘要 高分子材料的结晶度对其物理性能有显着影响。然而，尚未考虑聚合物材料内结晶度的分布，即使它同样重要地影响性能。在此，我们利用拉曼光谱研究了结晶度在聚（ε-己内酯）（PCL）薄膜中的空间分布情况。结果表明，整个薄膜的结晶度不均匀，而是沿球晶径向分布，球晶中心的结晶度较低。因此，熔程表现出相似的空间分布，球晶中心在较低温度下开始熔化。