Polylactic acid based novel degradable polyester and preparation method thereof

The invention discloses polylactic acid based novel degradable polyester and a preparation method thereof, and belongs to the field of a degradable function material. Environmental-load-free renewable resources including 10-HAD (10-hydroxydecanoic acid) and lactic acid dimer lactide are taken as main monomers, 10-HAD and 1, 4-butanediol are subjected to condensation polymerization firstly to prepare macro monomers, and then the macro monomers and lactide are subjected to ring opening polymerization to prepare a novel degradable segmented copolymer. Through change of conditions such as a raw material ratio, a feeding mode, catalyst variety and dosage, polymerization reaction time and reaction temperature and the like, a chain structure and composition of the polymer are regulated and controlled, and degradable polyester with different relative molecular weights and properties is obtained. The prepared degradable polyester has good thermal performance, flexibility and biocompatibility as well as controllable degradation period; and the novel degradable polyester can be widely applied to the fields of packaging, agriculture, medicine and the like.