Manufacture of polylactide stereocomplexes

A process for making polylactide stereocomplex, comprising, heating to a temperature of about 95.degree. C. to about 200.degree. C., at a pressure of about 1.4 MPa to about 700 MPa, a first mixture of preformed poly-D-lactide and L-lactide or preformed poly-L-lactide and D-lactide and a catalyst for lactide polymerization, wherein a weight ratio of said poly-D-lactide and L-lactide or poly-L-lactide and D-lactide is about 9:1 to about 1:9 to form a second mixture of poly-L-lactide and poly-D-lactide, and obtaining as a result thereof said stereocomplex in the form of a finished or semifinished part.