The branching structures in natural rubber (NR) were believed to be critical for its superior mechanical properties. However, it is challenging to unravel the branching structure-function relationship of NR due to the complexity of the system. Herein, polyisoprene-(polyisoprene-g-polylactide) (PI-PLA) as model compound containing branching structure was designed and synthesized, which can improve the modulus, strength and viscoelasticity activation energy compared to those of the pristine polyisoprene (PI). The reason is that the branching structure contributes to the entanglement between polyisoprene chains. In order to probe the effect of branching structure on noncovalently crosslinked system, the polyisoprene block of PI-PLA was epoxidized and mixed with Fe³⁺ ions to introduce coordination bonds. Compared with the linear counterpart, the branching structure obviously enhanced activation energy of coordinated polyisoprenes, remarkably improving the mechanical properies of elastomer.

天然橡胶（NR）中的支链结构被认为对其优越的机械性能至关重要。然而，由于系统的复杂性，解开NR的分支结构与功能的关系具有挑战性。在此，设计并合成了具有分支结构的模型化合物聚异戊二烯-（聚异戊二烯-g-聚丙交酯）（PI-PLA），与原始聚异戊二烯（PI）相比，可以提高模量，强度和粘弹性活化能。原因是分支结构有助于聚异戊二烯链之间的缠结。为了探讨支链结构对非共价交联体系的影响，将PI-PLA的聚异戊二烯嵌段进行环氧化并与Fe ³⁺混合离子引入配位键。与线性对应物相比，支链结构明显增强了配位聚异戊二烯的活化能，显着提高了弹性体的力学性能。