Method for preparing polyester by catalyzing lactide polymerization reaction by using Salen catalyst

• Main Authors: XU GUANGQIANG, WANG QINGGANG, KWAK HYUN HWA, WANG HUAN
• Format: Patent
• Language: Chinese; English
• Published: 23.02.2024
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention discloses a method for preparing polyester by catalyzing a lactide polymerization reaction by using a Salen catalyst, and belongs to the technical field of preparation of high polymer materials. The double-SalenAl catalyst used in the invention constructs a more limited catalytic microenvironment, so that the reaction activity of a metal center can be adjusted, the enantiomeric discrimination capability of racemic monomers is greatly enhanced, and greater asymmetric kinetic resolution polymerization is realized. In the polymerization method provided by the invention, the reaction operation is simple, the condition is mild, the stereoselectivity is high, and the ee value of the reaction can be as high as 97% and Krelgt when the yield is close to 50%; 500 selectivity is obtained, and the molecular weight is high (Mngt; according to the present invention, the polyester material with characteristics of low molecular weight distribution, narrow # imgabs0 # regularity (Pm = 0.98) is adopted, such that