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 meeting the needs of different applications

Inactive Publication Date: 2005-11-09
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 repeata

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0017] (2) Resynthesis of poly(glycolide / caprolactone) co-oligomers: add 23 grams of glycolide, 46 grams of caprolactone and 2.1 grams of ethylene glycol respectively in the polymerization tube, seal the tube under vacuum, at 160 ℃ for 4 days in an oil bath. The polymer was dissolved in chloroform, precipitated with ethanol, filtered and dried under vacuum to obtain a poly(glycolide / caprolactone) block co-oligomer (PGC(33 / 67) 2000) with a molecular weight of 2000 and a white powder .

[0018](3) Poly L-lactide ...

Embodiment 2

[0019] Embodiment 2: the synthetic method with embodiment 1, but the poly L-lactide oligomer that adopts molecular weight is 4000 and with 1,6-hexamethylene diisocyanate (HDI) as coupling agent. The synthesis method of the 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 respectively in the polymerization tube, seal the tube under vacuum, and set the temperature at 120 °C for 24 hours. The polymer was dissolved in chloroform, precipitated with ethanol, filtered and dried under vacuum to obtain a poly-L-lactide oligomer (PLA(4000)) with a molecular weight of 4000 in the form of a white powder.

Embodiment 3

[0020] Embodiment 3: the synthetic method with embodiment 1, but the poly L-lactide oligomer that adopts molecular weight is 6000 and with 2,4-toluene diisocyanate (TDI) as 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 to the polymerization tube respectively, seal the tube under vacuum, and set the temperature at 110 °C for 36 hours. The polymer was dissolved with chloroform, precipitated with ethanol, filtered and dried under vacuum to obtain a poly-L-lactide oligomer (PLA(6000)) with a molecular weight of 6000 in the form of 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 invention also relates to a process for the preparation of the above-mentioned polymers. Background technique [0003] Shape memory alloy (Shape memory alloy) is different from ordinary metals and alloys. It is an alloy with shape memory effect. d ) and significantly exceeding the yield point, once heated to the termination temperature of martensitic reverse transformation (A f ) above, it can spontaneously return to the shape of its parent phase martensite state. Shape memory alloys have a wide range of uses. In engineering, shape memory alloys with one-way memory function have been applied to the connection of pipe fittings, etc., which can make the precisely processed pipe joints tightly connected, and have airtight, fast assembly and reliable connection. , Can connect pipe fittings of different materials, etc. In addition, shape memory alloys with two-way shape memory h...

Claims

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Application Information

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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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