POLYMERIZATION OF MACROCYCLIC POLYESTER OLIGOMERS USING N-HETEROCYCLIC CARBENE AND METAL AMIDE OR METAL ALKOXIDE CATALYST

摘要

Mixtures or adducts of N-heterocyclic carbenes with metal amides or metal alkoxides are effective catalysts for the polymerization of macrocyclic polyester oligomers. The catalysts are stable at polymerization temperatures, and the polymerization is rapid, resulting in high monomer conversion, high molecular weight, and a mechanically sound material.