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Biological degradable shape memory polymer and its preparation process

A memory polymer and biological technology, applied in the field of biodegradable shape memory polymers, can solve the problems of shape memory performance, performance repeatability and mechanical performance degradation speed gap, etc., to achieve biodegradability, high repeatability, The effect of strong deformation retention

Inactive Publication Date: 2007-10-24
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a big gap between their shape memory properties, performance repeatability, mechanical properties, and degradation speed and the needs of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: (1) Synthesis of poly-L-lactide oligomer first: add 40 g of L-lactide, 1.2 g of ethylene glycol and 0.7 mg of stannous isooctanoate into the polymerization tube, and seal under vacuum Tube, react at 130°C for 16 hours. The polymer was dissolved in chloroform, precipitated with ethanol, filtered and dried in vacuum to obtain a poly-L-lactide oligomer (PLA(2000)) with a molecular weight of 2000 and a white powder.

[0017] (2) Resynthesis of poly(glycolide / caprolactone) copolymer oligomer: respectively add 23 grams of glycolide, 46 grams of caprolactone and 2.1 grams of ethylene glycol into the polymerization tube, seal the tube under vacuum, React in an oil bath at ℃ for 4 days. The polymer was dissolved in chloroform, precipitated with ethanol, filtered and dried in vacuum to obtain a white powder poly(glycolide / caprolactone) block copolymer oligomer (PGC(33 / 67)2000) with a molecular weight of 2000 .

[0018](3) Poly L-lactide oligomer and poly (glycolide / caprola...

Embodiment 2

[0019] Example 2: The same synthesis method as in Example 1, but using a poly-L-lactide oligomer with a molecular weight of 4000 and 1,6-hexamethylene diisocyanate (HDI) as the coupling agent. The synthesis method of poly-L-lactide oligomer with a molecular weight of 4000 is: add 80 grams of L-lactide, 1.2 grams of ethylene glycol and 1.4 mg of stannous isooctanoate into the polymerization tube, seal the tube under vacuum, and seal the tube at 120 React at ℃ for 24 hours. The polymer was dissolved in chloroform, precipitated with ethanol, filtered and dried in vacuum to obtain a poly-L-lactide oligomer (PLA(4000)) with a molecular weight of 4000 and a white powder.

Embodiment 3

[0020] Example 3: The same synthesis method as in Example 1, but using a poly-L-lactide oligomer with a molecular weight of 6000 and 2,4-toluene diisocyanate (TDI) as the coupling agent. The synthesis method of poly L-lactide oligomer with a molecular weight of 6000 is as follows: add 20 grams of L-lactide, 0.2 grams of ethylene glycol and 0.3 mg of stannous isooctanoate into the polymerization tube, seal the tube under vacuum, and seal it at 110 React at ℃ for 36 hours. The polymer was dissolved in chloroform, precipitated with ethanol, filtered and dried in vacuum to obtain a poly-L-lactide oligomer (PLA(6000)) with a molecular weight of 6000 and a white powder.

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Abstract

A biodegradable shape memory polymer is prepared through synthesizing poly-L-lactide oligomer, synthesizing poly(glycolide / caprolactone) cooligomer and using diisocyanate-type coupling agent to couple them together to obtain polyblock copolymer. Its advantage is high effect to hold the thermal deformation and thermally restoring the original shape.

Description

Technical field [0001] The invention relates to a biodegradable shape memory polymer. [0002] The present invention also relates to a method for preparing the above-mentioned polymer. Background technique [0003] Shape memory alloy (Shape memory alloy) is different from ordinary metals and alloys. It is an alloy with shape memory effect. This type of material has a critical temperature of strain-induced martensitic transformation (M d ) Is deformed below and significantly exceeds the yield point, once it is heated to the end temperature of martensite reverse transformation (A f ) Above, it can spontaneously return to its parent-phase martensitic state. Shape memory alloys have a wide range of uses. In engineering, shape memory alloys with one-way memory function have been used in the connection of pipe fittings, etc., which can make the precision-machined pipe joints tightly connected, and have air tightness, rapid assembly and reliable connection , Can connect pipe fittings of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04
Inventor 王身国闵长春贝建中
Owner INST OF CHEM CHINESE ACAD OF SCI
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