热塑性弹性体兼具橡胶的回弹性及热塑性塑料的加工性，应用前景广阔。但其易蠕变、永久压缩变形大、强度低等缺点限制了其应用领域。通过向热塑弹性体中引入氢键、离子键和可逆共价键的解决方案对其整体性能提升幅度有限。具有协同可逆共价交联结构特征的vitrimers为提升热塑弹性体强度、弹性和耐热性提供了新思路，但将vitrimer体系键联到共聚物弹性体分子中的合成方法、Vitrimer在弹性体中的作用等科学问题亟待解决。本项目从分子结构设计出发，设计带有协同可逆共价交联体系侧基的多点支化共聚物，探索有效接枝Vitrimer交联体系的方法，研究接枝密度和链段长度等对于物理交联和化学键可逆交联性质的影响，考察影响Vitrimer协同可逆交联反应的影响因素，揭示vitrimer的键接量和结构对材料性能的影响规律，研制出系列物理交联和协同可逆化学交联共存的热塑性弹性体，为高性能弹性体的合成提供理论支撑和新思路

Thermoplastic elastomers, generally possessing the processability of thermoplastics and the elasticity of vulcanized rubber, has been of very promising applications in technology. However, inferior resilience, dimensional stabilities and mechanical properties restricte its applications and developments. A great many methods have been adopted to solve these restrictions, such as multiple hydrogen bonds, ionic bonds and reversible covalent bonds. Unfortunately, the overall performance is not very satisfactory. Vitrimers are those materials consisted of thermally triggered associative reversible covalent bonds, which may provide an ideal solution of thermoplastic elastomers. Hence, how to introduce vitrimers to thermoplastic elastomers and the functions of vitrimers become an urgent issue to be solved. In this work, we design and synthesize multi-grafted copolymers by introducing vitrimers unites as side chains, and investigate the influences of graft methods, graft density and molecular of side chains on the properties of cross-linked networks. In addition, the factors affecting the associative reversible covalent bonds exchanges, the dependence of crosslinking density of reversible bonds on its processing temperature and the relationship between molecular structures and the final properties will be also evaluated.