Bulk solvent-free melt ring-opening polymerization of L-lactide catalyzed by Cu(II) and Cu(II)-Nd(III) complexes of the Salen-type Schiff-base ligand

摘要

A monometallic (Cu~(2+), 1) and a bimetallic (Cu~(2+)-Nd~(3+), 2) Salen-type Schiff-base complexes with different reactive species, could efficiently catalyze the bulk solvent-free melt ring-opening polymerization (ROP) of L-lactide. Especially for the bimetallic complex 2, the involvement of rare earth ion was important and influential to the catalytic behaviors.