The correlation between water molecules and polylactide was clarified. The crystallinity in stereocomplex (SC) crystal spherulites was investigated using microbeam wide-angle X-ray diffraction. The crystallinity was higher in the central region, and edge-on lamellae grew in a twisted manner. The hydrogen bonding in SC-crystal spherulites was evaluated via microbeam FT-IR spectroscopy in a humidity-controlled cell. The water-derived bands corresponding to OH vibration and HOH bending increased with increasing humidity. Microbeam FT-IR spectroscopy was used to evaluate the water absorption behavior of crystalline films depending on their position. Coarse-grained molecular dynamics simulations indicated that the number of adsorbed water molecules increased with decreasing crystallinity. In SC-crystal spherulites, water molecules are absorbed in both amorphous and crystalline regions but with greater difficulty in the crystalline regions. These insights into water molecule absorption on SC-crystal spherulite can facilitate the development of polylactide materials with controlled biodegradability for advanced medical and optical applications.

中文翻译：

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聚丙交酯立体络合物晶体球晶表面水分子的吸收：原位 FT-IR 光谱研究

阐明了水分子和聚丙交酯之间的相关性。使用微束广角 X 射线衍射研究了立构复合物 (SC) 晶体球晶的结晶度。中心区域结晶度较高，边缘片晶以扭曲方式生长。 SC 晶体球晶中的氢键通过湿度控制池中的微束 FT-IR 光谱进行评估。与 OH 振动和 HOH 弯曲相对应的水源带随着湿度的增加而增加。微束 FT-IR 光谱用于评估结晶膜根据其位置的吸水行为。粗粒度分子动力学模拟表明，吸附水分子的数量随着结晶度的降低而增加。在 SC 晶体球晶中，水分子在非晶区和结晶区都被吸收，但在结晶区更难被吸收。这些对 SC 晶体球晶上水分子吸收的见解可以促进开发具有受控生物降解性的聚丙交酯材料，用于先进的医疗和光学应用。