触变性凝胶因子构效关系及触变机理研究

Supramolecular gels with thixotropic properties can find potential applications in numerous rheological fields in industry. So far, low-molecular-weight gelators with thixotropic properties are all discovered by serendipity, and detailed studies on their self-healing mechanism and predicting principle limited. In this project, the gelators with thixotropic properties derived from acetal protected D-gluconamide with a straight aliphatic chain which was recently reported by our group are employed as a template, based on which two series of gelators will be designed and synthesized. The corresponding gelation and thixotropic abilities in water and organic solvents can be determined and thus the influence law of the solvent properties on the self-healing kinetics of the gel obtained. The self-healing mechanism will be explored via instrumental analysis. Treatment of the gelators via chemical modification or physical doping will be performed to further investigate the self-healing mechanism. The correlation among structure of the gelator molecule, structure of the self-assembling aggregate and thixotropic performance can be identified, and the molecular design principles for the gelators with thixotropic properties found. By correlating the type of the gelating solvent and thixotropic abilities of the gel with the solvent parameters, a theoretical model for predicting the gel formation in certain solvent for a known gelator can be constructed and a method for predicting the thixotropic properties of the gel established. The research will promote the theoretical development of the supramolecular chemistry, molecular gelation chemistry and rheology. Potential application can be found in the field of tissue engineering, and rheological agents in industry.

触变性分子凝胶在多个工业流变领域具有潜在应用前景，目前具有触变性的小分子凝胶因子均为偶然发现，对于其自修复机理及预测规律缺少深入研究。本项目以本课题组近期报道的触变性凝胶因子—缩醛取代葡萄糖酰(直链脂肪)胺为模板分子，设计并合成两个系列具有不同自组装基团的新型凝胶因子，测定其在水及有机溶剂中的凝胶性能、触变性能，总结溶剂性质对于凝胶自修复动力学的作用规律；通过仪器分析，研究凝胶的自组装机理；通过化学修饰或者物理掺杂，研究凝胶的自修复机理；从而揭示凝胶因子的分子结构-自组装聚集体结构-触变性能之间的关系，总结出触变性凝胶因子的分子设计原则。将凝胶因子可凝胶溶剂种类、凝胶触变性能分别与溶剂参数进行关联，构建凝胶因子可凝胶溶剂的理论预测模型，建立凝胶触变性能的预测方法。此研究成果将推动超分子化学、分子凝胶化学、流变学的理论研究，并且在组织工程及工业流变助剂领域具有潜在应用前景。

触变性分子凝胶在多个工业流变领域具有潜在应用前景，目前具有触变性的小分子凝胶因子均为偶然发现，对于其自修复机理及预测规律缺少深入研究。.本项目以触变性凝胶剂—缩醛取代葡萄糖酰(直链脂肪)胺为模板分子，设计并合成了具有不同自组装基团的新型凝胶因子，测定其在水及有机溶剂中的凝胶性能、触变性能，总结溶剂性质对于凝胶自修复动力学的作用规律。通过仪器分析，表征其在不同溶剂体系中的自组装机理；通过化学修饰或者物理掺杂，研究凝胶的自修复机理；从而揭示凝胶因子的分子结构-自组装聚集体结构-触变性能之间的关系。设计合成了具有三联吡啶基团的触变性超分子凝胶剂、具有触变性的超分子离子液体凝胶、具有触变性的超分子水凝胶、用于快速回收泄漏的芳烃和油品的超分子凝胶剂。.通过本项目的研究，凝胶因子的分子结构-自组装聚集体结构-触变性能之间的关系，总结了触变性凝胶因子的分子设计原则，为触变性凝胶因子的设计提供了理论指导。通过上述基础研究，为超分子化学、分子凝胶化学、流变学、柔性材料、环保材料等领域的发展做出一份贡献。