中文摘要：

聚乳酸立构复合物（SC-PLA）由左旋聚乳酸（PLLA）和右旋聚乳酸（PDLA）以31螺旋构象并排堆砌而成，由于分子链间的紧密堆积，SC-PLA具有更高的晶体稳定性、熔点（约比PLLA高50℃）以及良好的热、力学、降解等性能。PLLA和PDLA共混是目前制备SC-PLA的一类常用方法，包括溶液共混、熔融共混、微波辐射共混等，SC-PLA在形成过程中会受到PLLA和PDLA的分子量、光学纯度、混合比例等因素影响。本文综述了PLLA和PDLA通过共混形成SC-PLA的条件和机理，以及SC—PLA的微观结构、性能和应用现状。

英文摘要：

Stereocomplex polylactide （SC-PLA） can be formed by the packing of poly （L-lactide） and poly （D-lactide） chains side by side in a 3; helical conformation. Thanks to the dense packing and high physical interaction of the chains, the SC-PLA is featured by superior stability and melting point （ca. 50℃ higher than that of PLLA） as well as excellent thermal, mechanical and degradation properties. PLLA/PDLA blending is a common method for preparing SC-PLA, including solution blending, melt blending and microwave radiation blending and so on. During the forming process, the SC-PLA can be affected by the molecrlar weight, optical purity, mixing ratio of PLLA and PDLA and other factors. This review addresses the formation conditions and mechanisms, microstructures, properties and potential applications of the SC- PLA formed by blending PLLA with PDLA.