In view of the fact that thermosetting plastics cannot be reused

people have successfully prepared vitrimer materials on the basis of cross-linked covalent networks. Covalent adaptive networks may be classified into two groups depending on their exchange mechanism

one is dissociative covalent adaptive networks

represented by the most typical Diels-Alder reaction

which is widely used in the repeated use of materials

self-repairing and so on; The second group is associative covalent adaptive networks

commonly based on the transesterification mechanism

which is also the structural basis used by vitrimer materials. This paper mainly reviews the characteristics of vitrimer materials and discusses the progress of vitrimer materials in recent years based on the different mechanisms of transesterification

transamination

alkyl transfer and DNA sequence.