The present invention relates to a process for preparing a PLLA/PDLA stereocomplex polymer, comprising the steps of:
a) polymerizing L,L-lactide to obtain PLLA;
b) polymerizing D,D-lactide to obtain PDLA;
c) mixing the PLLA obtained in step a) with the PDLA obtained in step b) in an extruder, in the presence of a supercritical fluid, thereby preparing a PLLA/PDLA stereocomplex polymer; and
d) optionally, removing the supercritical fluid from the PLLA/PDLA stereocomplex polymer obtained in step c).
本发明涉及一种制备 PL
LA/PD
LA 立体复合物聚合物的工艺,包括以下步骤
a) 聚合 L,L-内酯,得到 PL
LA;
b) 聚合 D,D-内酯,得到 PD
LA;
c) 在超临界流体存在的情况下,在挤压机中将步骤 a) 中得到的聚
乳酸与步骤 b) 中得到的 PD
LA 混合,从而制备出聚
乳酸/PD
LA 立体共聚物聚合物;以及
d) 可选地将超临界流体从步骤 c) 中得到的 PL
LA/PD
LA 立体聚合物中去除。