Abstract Dip coating process used at various withdrawing speeds showed a great ability to control the crystalline structure of thin films of poly(L-lactic acid) which can be of great importance for applications where mechanical or optical properties are involved. Thin films were studied by Atomic Force Microscopy and Grazing Incidence Angle X-ray Diffraction. Withdrawing the silicon substrate in the draining regime (at high speeds) led to amorphous films with flat surface whatever the solvent and the molar mass. At low speeds (capillary regime), AFM demonstrated the presence of spherulites or hedrites in the films depending on the solvent and the molar mass. GIXRD showed that spherulites were less crystallized than hedrites. This difference was attributed to solvent evaporation rate.

中文翻译：

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聚（L-乳酸）在浸涂法制备的薄膜中的约束结晶

摘要 在各种拉拔速度下使用的浸涂工艺显示出控制聚（L-乳酸）薄膜晶体结构的强大能力，这对于涉及机械或光学性能的应用非常重要。通过原子力显微镜和掠入射角 X 射线衍射研究薄膜。无论溶剂和摩尔质量如何，在排水状态下（以高速）撤回硅基板都会产生具有平坦表面的无定形薄膜。在低速（毛细管状态）下，AFM 证明根据溶剂和摩尔质量，薄膜中存在球晶或水晶石。GIXRD 表明球晶的结晶度低于球晶石。这种差异归因于溶剂蒸发速率。