基于聚乳酸的离子凝胶及多孔材料

Polylactide ion gel is formed by the crystallization of polylactide in the ionic liquid; and the ionic liquid is included in the three dimensional network constructed by the crystallites of polylactide. As a green alternative solvent, ionic liquid, having negligible vapor pressure and high thermal stability, is beneficial for the conservation of the structure and properties of polylactide ion gel. As a result, it is promising to extend the application of polylactide ion gel. Based on the previous research works, in this project we will systematically investigate the crystallization behavior of polylactide in the ionic liquid and its relation with gelation. In the meantime, sol-gel transition and related impact factors will be disclosed, aiming to develop the methods for tailoring the structure and transition temperature of polylactide ion gel. In addition, porous material will be prepared by removing ionic liquid from polylactide ion gel. The relationship between microscopic morphology and porosity of porous material and the structure of ion gel will be clarified. This will provide a new thought and route for the preparation of polylactide porous material. The execution of this project, on the one hand, will give further insights into the transition mechanism of polymer physical gel. On the other hand, it will promote the green preparation of polylactide porous material.

聚乳酸离子凝胶是通过聚乳酸在离子液体中结晶而形成的；离子液体被包含于聚乳酸晶粒所构筑的三维网络中。作为绿色替代溶剂，离子液体的非挥发性和高热稳定性有利于聚乳酸离子凝胶结构和性能的保持，继而有望扩大其应用范围。本项目拟在前期研究工作的基础上，系统研究聚乳酸在离子液体中的结晶行为及其与凝胶化的关系，揭示溶胶－凝胶转变机制及其影响因素，建立聚乳酸离子凝胶结构和转变温度调控的方法和手段；此外，通过除去离子凝胶中的离子液体制备聚乳酸多孔材料，阐明多孔材料微观形貌及孔隙率与离子凝胶结构的关系，为聚乳酸多孔材料的制备提供新的思路和方法。通过本项目研究的开展，不但可以进一步拓展对高分子物理凝胶及其转变机制的认识，还能够实现聚乳酸多孔材料绿色化制备，具有重要的理论意义和应用价值。

本项目开展了聚乳酸离子凝胶及其与结晶的关系、溶胶-凝胶转变调控与性能以及聚乳酸多孔材料结构形成与调控等方面的研究。阐明了聚乳酸在离子液体中的结晶行为及其与凝胶化的关系，从不同尺度明晰了溶胶-凝胶转变机制，建立了调控溶胶-凝胶转变的方法和手段，揭示了离子凝胶结构对聚乳酸多孔材料性能的影响，明确了聚乳酸多孔材料的结构形成及转变。 . 本项目研究为拓展聚乳酸离子凝胶的应用提供了科学依据，并为聚乳酸多孔材料结构与性能控制提供了新的思路和方法，具有重要的科学价值和现实意义。本项目有效地执行了计划任务要点，发表SCI论文9篇，授权国家发明专利1项，培养研究生6名。本项目全面完成了预期研究结果，并达到了预期研究目标。