Dynamics of polymer chains not only is a fundamental bridge between the structures and properties of polymers but also plays a crucial role in the formation of polymer structures. The slow crystallization caused low crystallinity of Poly (lactic acid) (PLA) is the bottleneck for its applications. The chain dynamics affected memory for recrystallization morphology and behavior of poly (d-lactic acid) (PDLA) were observed by POM and characterized by DSC. The POM images showed that the PDLA could outline the morphology of original banded spherulites after recrystallization from melting of the original spherulites. The re-formed crystal inherited the crystalline location from the original crystalline morphology, forming a circle ring morphology that is following up the initial banded spherulites, even though the circle ring was constructed of smaller spherulites. DSC results showed various crystallization behaviors of PLA recrystallization with different thermal history. The influence of heating temperature, keeping time, and cooling rate on the recrystallization morphology were investigated and discussed. It was proposed that the adjustment and change of PDLA chain conformation is more difficult in various states between the crystalline and melt than that of other polymers, which relates to the strength of melt and entropy.

聚合物链的动力学不仅是聚合物结构与性能之间的基本桥梁，而且在聚合物结构的形成中也起着至关重要的作用。缓慢结晶导致聚乳酸（PLA）结晶度低是其应用的瓶颈。链动力学影响了聚（d）重结晶形态和行为的记忆。通过POM观察并通过DSC表征β-乳酸（PDLA）。POM图像显示，PDLA可以在原始球晶熔化后重结晶后勾勒出原始带状球晶的形貌。重新形成的晶体继承了原始晶体形态的晶体位置，形成了跟随初始带状球晶的圆环形态，即使该环是由较小的球晶构成的。DSC结果表明，具有不同的热历史的PLA重结晶具有多种结晶行为。研究和讨论了加热温度，保温时间和冷却速率对重结晶形态的影响。