A six-toothed aminophenoxy rare earth complex substituted with a nitrogen-containing heterocycle, and a preparation method and application thereof
By designing a nitrogen-containing heterocyclic substituted hexa-dental aminophenoloxy rare earth complex, the problem of insufficient activity and stereoselectivity of rare earth metal complexes in catalytic racemic lactide ring-opening polymerization is solved, and efficient catalytic effect and impurity tolerance are achieved. The copolymerization of lactide and ε-caprolactone can be carried out to obtain high molecular weight polyester materials.
Patent Information
- Application Number
- CN202310039418.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-01-11
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2043-01-11
AI Technical Summary
The existing rare earth metal complexes have insufficient activity and stereoselectivity in the catalytic racemic lactide ring-opening polymerization, and are low in tolerance to impurities, making it difficult to achieve industrial application.
A class of nitrogen-containing heterocyclic substituted hexadentate aminophenoloxy rare earth complexes were developed to regulate the Lewis acidity and steric hindrance of the rare earth metal center by changing the azeheterocyclic and phenoloxy ortho-substituents in the ligand, used to catalyze the ring-opening polymerization of racemic lactide and applied to the copolymerization of lactide and ε-caprolactone.
The catalytic effect of high activity and high stereoselectivity is achieved, and catalytic activity can be maintained in the presence of impurities, and the multi-block copolymerization of lactide and ε-caprolactone is achieved through one-pot feeding to obtain a high molecular weight polyester material.