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

A technology of memory effect and processing method, applied in medical science, prosthesis, surgery, etc., can solve the problem of low resilience of finished products

Inactive Publication Date: 2007-07-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that the polylactic acid polymer must be deformed at 15-20°C above the glass transition temperature and the recovery force of the finished product is very low after the deformation is fixed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific Embodiment 1: The polylactic acid-based polymer in this embodiment obtains the processing method of cold deformation forming shape memory effect through the following steps: (1) Compression molding: heat the polylactic acid-based polymer with a relative molecular weight of 100,000 to 400,000 20-30°C above the melting point, when the polylactic acid polymer is completely melted, the melted polylactic acid polymer is molded under the condition of a pressure of 2-5Mpa, and the mold is molded at a cooling rate of 10-50°C / min. The molded polylactic acid polymer is cooled to room temperature; (2) annealing treatment: put the molded polylactic acid polymer into an annealing furnace, anneal at 80-120°C for 15-60min, and then cool to room temperature. The polylactic acid polymer has obtained the cold deformation forming shape memory effect.

[0005] The polylactic acid polymer treated by this embodiment obtains the cold deformation forming shape memory effect, the cryst...

specific Embodiment approach 2

[0006] Specific embodiment two: The difference between this embodiment and specific embodiment one is that in step (1) the polylactic acid polymer is poly-L-lactide in the degradable polylactic acid polymer for medical use, poly-L-lactide can be Degradable copolymers, poly-L-lactide blends or poly-L-lactide composites. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0007] Specific embodiment three: The difference between this embodiment and specific embodiment two is that in step (1), the poly-L-lactide degradable copolymer is poly-L-lactide / ε-caprolactone copolymer, poly-L-lactide / DL-lactide copolymer or poly-L-lactide / glycolide copolymer; the poly-L-lactide in the copolymer accounts for 80-95% of the molar percentage of the copolymer. Other steps are the same as in the second embodiment.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C61/06B29C43/02B29C43/58B29C71/02A61L17/12A61L27/18A61L31/06B29K67/00B29K105/06
Inventor 蔡伟鲁玺丽高智勇
Owner HARBIN INST OF TECH
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