Biodegradable block copolyester based on lactide-(alicyclic-co-aromatic)-lactide

Abstract

The invention relates to the field of high polymer materials, and discloses a biodegradable block copolyester based on lactide-(alicyclic-co-aromatic)-lactide. The structural formula of the biodegradable block copolyester is B-A-B, wherein A is an alicyclic-aromatic random copolyester chain segment, and the weight-average molecular weight of the alicyclic-aromatic random copolyester chain segment is 500-150,000 g / mol; B is a polylactide chain segment formed by polymerizing lactide in a ring opening manner, and the weight-average molecular weight of the polylactide chain segment is 500-200,000 g / mol; and the total weight average molecular weight of the block copolyester is 10,000-500,000 g / mol. The block copolyester is obtained by copolymerizing the alicyclic dibasic acid, the aromatic dibasic acid and the ethylene glycol and further performing ring opening on the lactide, the degradation property and the mechanical property of the copolyester are considered, and the block copolyester can be used as an environment-friendly material and a biomedical material.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a biodegradable block copolyester based on lactide-(alicyclic-co-aromatic)-lactide. Background technique [0002] Synthetic polymers have unique mechanical and thermal properties due to their various chain compositions, chain structures, and aggregate structures. Its quality is stable and it can be used for a long time, which has greatly changed the production and life of human beings. Polyester is one of the most widely used synthetic polymers in the world, mainly polyethylene terephthalate (PET), which is non-toxic, transparent, stable in thermal and mechanical properties, and is therefore widely used in textiles , packaging, information, electronics and other fields. [0003] Although PET itself is non-toxic, it exists stably in nature for a long time. According to reports, the existence cycle of PET in the natural environment is at least 16-48 years, and bottle products ca...

AI Technical Summary

Problems solved by technology

However, these modified copolyesters are usually random copolymers with a single topology. While the degradation performance is improved, the introduction of random aliphatic segments will reduce the mechanical strength of the material; on the other hand, the biological Less degradable modified products

[0005] CN 103570925A discloses a biodegradable polyester synthesized by adjusting the polyester composition. The polyester contains aliphatic, alicyclic, and aromatic segments, but its chain structure is random copolymerization, and the material stretches Intensity is low; CN105732964A discloses a kind of preparation method of dimer fatty acid polylactic acid block polyester, and the method for obtaining block structure is to further polymerize the aliphatic prepolymer and polylactic acid prepolymer under the action of a catalyst, This method has fewer polymerization active sites, and is easy to form a mixture of block polyester and two prepolymers; CN 101684175A discloses a biodegradable multi-block polyester copolymer, and its polyhydroxy acid segment is obtained by The prepolymer is further chain extended and connected to the aromatic polyester segment, which also has the problem of fewer active sites for chain extension