Construction And Properties Of Anionic Gel Polymer Based On Post-Modification

Supramolecular chemistry has been developed for a long time,from metal coordination to non-metallic coordination driven self-assembly,a large number of supramolecular structures with unique functions were reported,and have been applied in the research area of molecular recognition,light catalysis,biological sensing,as well as light emitting devices.However,anion-coordination-driven supramolecular structures used in gel polymer are not extensive studied.In this thesis,a C₂ symmetric bis（biurea）ligand L was designed and synthesized,in which an unreacted aniline was linked to the central N atom.Ligand L is able to coordinate with anion through the urea groups to form anion complexes.Then a gel polymer containing triple-helical structure was synthesized by the amide reaction between aniline and disuccinimidyl sebacate.It is of great significance to enrich the preparation of new supramolecular functional materials.,there are two chapters in full text,including the following contents:The first part is introduction,which mainly describes the research background of supramolecular chemistry and the development of supramolecular coordination chemistry.The second part in this chapter mainly includes metal coordination and urea-based anion coordination,supramolecular gel polymer,as well as the motivation and research significance of the selected projects.The second chapter describes the synthesis of ligand L and anion complexes,the synthesis and characterization of gel polymers.Ligand L could form A₂L₃ helical complexes by coordinating with different anion（phosphate,sulfate,carbonate）.The formation of these structures were confirmed by one-dimensional and two-dimensional nuclear magnetic,mass spectrometry,etc.Because the anion complex assembled from phosphate anion is more soluble than that from sulfate or carbonate anion,all the subsequent experiments are based on the phosphate complex.Disuccinimidyl sebacate was added to complex,and the amide reaction took place under alkaline conditions.A gel is formed after keeping for 5 h and characterized by NMR,SEM,and rheometer.