Novel polyester with different sequence structures and crystallinity and preparation method and application thereof

Abstract

The invention discloses novel polyester with different sequence structures and crystallinity and a preparation method and application thereof, and belongs to the technical field of polyester materials. The problems that traditional polyglycolic acid is too fast and uncontrollable in degradation, single in mechanical property, narrow in processing window, insufficient in material toughness, narrow in mechanical property spectrum, poor in thermal property and the like are solved. L-hydroxybutyric acid or D-hydroxybutyric acid is used as a raw material, cyclization is performed under the catalytic action to obtain L-type ethyl lactide monomers and D-type ethyl lactide monomers, the two monomers react in a specific stereoselective catalytic system to obtain a polyglycolic acid polyester material with a specific sequence structure, such as an isotactic structure and a syndiotactic structure, and the polyglycolic acid polyester material is adjustable in crystallinity, good in stability and good in stability. The thermal property is excellent, and meanwhile, the good mechanical property is achieved. The polyester can be synthesized under the conditions of less solvent and lower catalyst dosage, has the advantages of atom economy and price, can reduce the dependence on petrochemical resources due to the fact that the initial raw material is natural amino acid, and is environment-friendly.

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