Vitrimer通常是指含动态键的交联聚合物，且在不破坏交联网络拓扑结构的情况下具有可重复加工性能，因此兼具了热固性和热塑性高分子材料的优点，在近年来被广泛关注，然而对vitrimer材料动态结构及可重复加工性能微观机理的研究却鲜有报道。因此本项目旨在制备环氧树脂 vitrimer材料的基础上，利用多种固体NMR技术结合DSC，DMA等方法，研究环氧树脂vitrimer材料的微观链结构和动力学对vitrimer宏观力学性能及可重复加工性能的调控规律，以及vitrimer转变温度Tv所对应的物理意义及微观机理，并进一步发展原位检测环氧vitrimer体系中动态酯交换的固体NMR新方法，进而从分子水平上阐明环氧树脂vitrimer材料的结构—性能关系，为设计高性能高分子材料提供实验和理论指导，并从分子层面建立高分子物理—高分子化学—高分子加工之间的联系。

Vitrimer is a kind of cross-linked polymer with dynamic bonds, which can be reprocessed without destroying the topological network structures. Hence, it combines the properties of thermoplastic and thermoset polymer materials, and has received considerable attention in recent years. However, there are rare studies on dynamic structures and the mechanism of reprocessing ability of vitrimers. Herein, this project is aimed to systematically investigate the microscopic origin of the dynamic structures and the reprocessing ability of epoxy resin vitrimers. Multiple solid-state NMR methods, in combination with DSC and DMA, will be utilized to investigate the hierarchical structures and dynamics of epoxy vitrimers, and thus to elucidate the effect of chain structures and dynamics on the macroscopic mechanical properties and reprocessing abilities as well as the corresponding physical meaning of the vitrification temperature (Tv) in epoxy vitrimers. On that basis, we would like to further develop novel solid-state NMR methods for in-situ detecting the transesterification exchange reaction in the epoxy vitrimers, in order to further elucidate the structure-property relationship and the mechanism of reprocessing ability at a molecular level, and thus to provide experimental and theoretical guidance for designing high-performance vitrimer materials. To a large degree, this project could well bridge the gap between polymer physics, polymer chemistry and polymer engineering at a molecular level.