Process method for polymer in poly lactic acid series to obtain shape memory effect in cold deformation molding

Abstract

A process for making the polylactic acid series polymers have the shape memory effect after they are cold-shaped includes die pressing and annealing. After the material is deformed at ordinary temp, its original shape can be restored by heating it.

Description

technical field

[0001] The invention relates to a method for making a medical degradable material obtain a cold deformation forming shape memory effect. Background technique

[0002] Polylactic acid polymer is an important biomedical polymer material, which has good biocompatibility and biodegradability, and has been widely used in fracture internal fixation, tissue engineering scaffolds, surgical sutures, and drug controlled release systems. application. The most commonly used degradable polylactic acid polymer in medicine is poly-L-lactide, poly-L-lactide copolymer, poly-L-lactide blend or poly-L-lactide composite. Polylactic acid polymers have a shape memory effect of thermal deformation, that is, heat the material to 15-20°C above the glass transition temperature, deform it and cool the material to 15-20°C below the glass transition temperature, and the deformation is fixed. , the deformation recovers when the material is heated again above the glass transition tempera...