How can dendritic macromolecular polylysine achieve highly controllable molecular weight distribution through precise three-dimensional structures?
Publish Time: 2026-04-07
In the fields of modern biomaterials and nanoscience, dendritic macromolecular polylysine has attracted widespread attention due to its highly controllable three-dimensional structure and rich functionalization potential. Compared with linear polymers, dendritic polylysine achieves precise control and highly uniform molecular weight distribution through a layered structure design radiating outward from the core. This characteristic not only enhances the predictability of materials but also provides a powerful molecular platform for drug delivery, gene vectors, tissue engineering, and the development of nanocomposites.1. Controlled Polymerization Strategy for Precise Molecular WeightThe synthesis of dendritic polylysine relies on layer-by-layer controlled polymerization strategies, including divergent polymerization and convergent polymerization. In divergent polymerization, synthesis begins with a core starting unit, generating a highly branched dendritic structure by extending branches layer by layer. With each additional layer, the molecular weight increases by a predictable multiple. This method allows for strict control of the number of molecular units in each layer, thereby achieving precise molecular weight regulation. Convergent polymerization, on the other hand, connects from the branch ends to the core. By pre-synthesizing branch fragments before connecting them to the core, it improves the uniformity and controllability of the molecular structure and effectively reduces defect formation. Combining these two strategies allows for achieving ideal molecular weight ranges and distributions according to application requirements.
