Poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) can form stereocomplex (sc) crystallites in their racemic blends. Compared to the homocrystalline poly(lactic acid) (PLA)

sc-type PLA has much better heat and chemical resistances. Therefore

sc crystallization of PLA has been an effective method to improve its physical properties. However

the formations of homo and sc crystallites are competing in the crystallization of PLLA/PDLA racemic blends. A critical issue to prepare the heat-resistant sc-type PLA is to understand the formation conditions and mechanism of sc crystallization

and further to control and promote the extent of sc crystallization. Sc crystallization is affected by a variety of factors such as the chemical structure of polymer component

crystallization and processing conditions in PLLA/PDLA racemic blends

and their influential mechanisms are very complicated. According to the various factors influencing sc crystallization

this paper will review the research progress of sc crystallization behavior and preparation of sc materials for PLLA/PDLA blends in recent years from the aspects of polymer molecular weight

stereoregularity

blend ratio

polymer topology

crystallization method and condition

and addition of additive or other components. It is expected that this review can provide a theoretical guideline for the preparation of heat-resistant biobased PLA materials.