Shape memory material based on poly(e-caprolactone), preparation and metod of application

A memory material, caprolactone technology, applied in the field of medical polymer materials, can solve problems such as no shape memory function

Inactive Publication Date: 2005-01-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are biocompatible, non-toxic, degradable and absorbable ...

Method used

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  • Shape memory material based on poly(e-caprolactone), preparation and metod of application
  • Shape memory material based on poly(e-caprolactone), preparation and metod of application
  • Shape memory material based on poly(e-caprolactone), preparation and metod of application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The concentration of 114g ε-caprolactone, 1.4g ethylene glycol and 5ml is 0.1molL -1 Sn(Oct) 2 Add the / toluene solution successively into a glass bottle that has been fully dried and equipped with a magnetic stirring bar, add an equal volume of toluene with a syringe, stir evenly, put it in a constant temperature oil bath at 120°C, heat the reaction for 24 hours, and pour it after cooling At room temperature, a toluene solution of poly(ε-caprolactone) (PCL) with double-terminated hydroxyl groups was obtained.

[0029] Add the calculated amount of 2,4-toluene diisocyanate (TDI) to the solution, heat and stir at 65°C for 15 minutes, then add the calculated amount of ethylene glycol (EG), so that the molar number of TDI is exactly equal to that of PCL and EO sum of moles. The reaction was continued to stir at 65°C for 3 hours, then the reaction product was dissolved in chloroform, precipitated with hexane, and dried under vacuum at 40°C for 24 hours.

[0030] By chang...

Embodiment 2

[0036] The reaction conditions in Example 1 are adopted, but in the first step of PCL synthesis, after obtaining the PCL toluene solution with double-terminal hydroxyl groups, instead of directly carrying out the next step reaction, PCL is precipitated with n-hexane, washed, and vacuum-dried. Obtain pure PCL prepolymer. Then dissolve the PCL prepolymer in toluene, add 0.1molL -1 Concentration of Sn(Oct) 2 / toluene for the next reaction. Compared with Example 1, the advantage of this reaction procedure is that the molecular weight and functionality of the PCL prepolymer can be accurately determined, so that the second step reaction can be accurately controlled to obtain a higher molecular weight. However, the melting point, crystallization temperature and minimum deformation recovery temperature of the product are basically unchanged.

Embodiment 3

[0038] The reaction procedure of Example 1 was followed, but substituting 2,4-toluene diisocyanate for 2,6-toluene diisocyanate. The melting point, crystallization temperature and minimum deformation recovery temperature of the obtained product are in the same temperature range as in Example 1.

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Abstract

The invention relates to a polyurethane which uses poly(exsilon-caprolactone) as soft block and has shape memory function. It is made up by using poly(epsilon-caprolactone) (PCL) of double hydroxyl and diisocyanate and small moleculeg glycol (EO) through process of reaction. Its melting point is in the range of 40 deg.C-60 deg.C, and is dependent on the molecular weight of PCL and the mole ratio of PCL and EO, and its restorable deformation temperature is room temperature to 60 deg.C and the deformation restorable temperature is room temperature to 60 deg.C and the deformation restorable temperature is room temperature to 50 deg.C, and also is dependent on the molecular weight of PCL and mole ratio of PCL and EO. Under the condition of that the extension is 300% and compresses is three times its deformation restoration rate can be up to 100%. Its deformation restorable temperature can be controlled near by human body temperature by utilizing regulation of polymer composition, so that it has biodegradation function and can obtain important application in medicine field.

Description

technical field [0001] The invention belongs to a shape-memory material based on poly(ε-caprolactone) and a preparation and use method thereof, and belongs to the field of medical polymer materials. Background technique [0002] Shape memory materials have a wide range of applications in industry and medicine, such as sensors, transducers, protection components, actuators, and implanted components in the human body. Among them, various catheters and stents made of Ni-Ti alloy have been clinically used in surgical operations and interventional therapy. They have many advantages, such as small size, light weight, large deformation, large supporting force, etc., but they also have obvious shortcomings, such as incompatibility with human tissue, the toxicity of Ni in the alloy, and long-term or life-long implantation in the human body. , The leakage of Ni element is harmful to health. So far, people have discovered a lot of polymer materials with shape memory function, some of...

Claims

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Application Information

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IPC IPC(8): C08G18/40C08G18/72
Inventor 景遐斌平鹏陈学思徐效义边新超杨立新梁奇志
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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