METHOD FOR PRODUCING stereocomplex PLLA / PDLA.

摘要

A production process for obtaining a stereocomplex polymer 40-60 / 60-40 PLLA / PDLA average molecular weight in number of at least 15,000 Dalton comprising a bulk polymerization of lactide to form LL PLLA, polymerization mass DD lactide to form PDLA and the mixture in the absence of solvent, the two polymer obtained above in the proportions 60-40 / 40-60 in the presence of the initial catalyst system employed during the polymerization of PLLA and PDLA and optionally in the presence of L-lactide and D-lactide not convention to a temperature above the melting temperature of the PLA without exceeding the temperature of 250 ° C. The polymer stereocomplex PLLA / PDLA obtained is stabilized, if necessary démonomérisé then granulated.