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Application of a polyurethane urea hydrogel with shape memory function

A polyurethane urea and hydrogel technology, applied in the field of polyurethane urea hydrogel, can solve problems such as failure, tissue damage, and reduced activity of bioactive components

Active Publication Date: 2017-01-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deformation of all SMPs (including the water-responsive SMPs that have been reported so far) needs to be produced at a higher temperature (the T of the polymer) g or T m above), it is easy to cause the activity of bioactive components (such as proteins and drugs, etc.) on the surface or inside of the material to be greatly reduced or even invalidated.
At the same time, most of the current SMPs are heat-sensitive, and their deformation recovery also needs to be carried out at a higher temperature, which is easy to cause damage to the tissues around the implantation site.

Method used

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  • Application of a polyurethane urea hydrogel with shape memory function
  • Application of a polyurethane urea hydrogel with shape memory function
  • Application of a polyurethane urea hydrogel with shape memory function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A kind of high-strength polyurethane urea hydrogel provided by the present embodiment, its synthetic route is:

[0058] ;

[0059] In the formula, R represents the alkyl or aromatic group between the two isocyanate groups in the diisocyanate, R' represents the alkyl or aromatic group between the two amine groups in the diamine, Represents polyethylene glycol (PEG), its molecular weight is 200 ~ 20000 g / mol; n is the degree of polymerization.

[0060] The specific steps of synthesis are: adding diisocyanate OCN-(CH 2 ) 12 -NCO, then add 5 μl catalyst dibutyltin dilaurate, and react at 80 °C for 2 h. Then add diamine H to the reaction flask 2 N-(CH 2 ) 6 -NH 2 , and stirred for 3 h at 20 °C under nitrogen protection. Strictly control the molar ratio of the reaction raw materials, that is, PEG: diisocyanate: diamine = 1:2:1. After the reaction, the obtained solution with high viscosity was precipitated in n-hexane to obtain a white flocculent solid. The produc...

Embodiment 2

[0076] This embodiment provides a synthetic method of high-strength polyurethane urea hydrogel, and the specific steps are as follows:

[0077] Add diisocyanate IPDI to the PEG acetone solution with a molecular weight of 10000 g / mol, and then add 5 μl catalyst stannous octoate, and react at 50 °C for 3 h. Then, the diamine 3,3′-methylenediphenylamine was added into the reaction flask, and stirred under nitrogen protection at 40 °C for 3 h. Strictly control the molar ratio of the reaction raw materials, that is, PEG: diisocyanate: diamine = 1:2:1. After the reaction, the obtained solution with high viscosity was precipitated in ether to obtain a white flocculent solid. The product is dried and dissolved in chloroform, and then poured into a mold for molding. After the solvent is evaporated and dried, it is allowed to swell in distilled water until the swelling balance is reached, and a polyurethane urea hydrogel is obtained.

[0078] The characteristic of this example is to u...

Embodiment 3

[0080] The high-strength polyurethane urea hydrogel provided in this example. The concrete steps of its synthetic method are as follows:

[0081] Add the diisocyanate 1,3-diisocyanate to the PEG acetone solution with a molecular weight of 200 g / mol, and then add 5 μl catalyst pyridine, and react at 80 °C for 3 h. Then add diamine to the reaction flask , stirred and reacted under nitrogen atmosphere at 40 °C for 3 h. Strictly control the molar ratio of the reaction raw materials, that is, PEG: diisocyanate: diamine = 1:2:1. After the reaction, the obtained solution with high viscosity was precipitated in n-hexane to obtain a white flocculent solid. The product is dried and dissolved in methanol, and then poured into a mold for molding. After the solvent is evaporated and dried, it is allowed to swell in distilled water until the swelling balance is reached, and a polyurethane urea hydrogel is obtained.

[0082] The characteristic of this embodiment is to use aromatic diiso...

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Abstract

The invention relates to the application of a polyurethane urea hydrogel with shape memory function. The hydrogel is a copolymer of polyethylene glycol, diisocyanate and diamine. The polyurethane urea hydrogel provided by the present invention not only has a temperature-responsive shape memory function, but also has a water-responsive shape memory function at room temperature, and can also rely on the good tensile properties of the prepared hydrogel and the dehydration crystallization-absorption decrystallization process of PEG The deformation generation, immobilization and recovery under the conditions of room temperature and aqueous medium are realized by the accompanying crystalline phase transition in the material. It also has the characteristics of large elongation and high tensile strength, and has application prospects in biomedical hydrogels, tissue engineering, hydrogel scaffold materials, and biomedical devices endowed with shape memory functions.

Description

technical field [0001] The invention relates to the application of a polyurethane urea hydrogel which has excellent mechanical properties and can realize the shape memory function of water or heat response. Background technique [0002] A hydrogel is a substance that swells in water but does not dissolve. In the past few decades, a lot of work has been devoted to the research of hydrogels, which can be widely used in biomedicine, such as drug carriers, wound dressings, cartilage replacement, artificial kidney membranes and other medical device. However, due to the weak mechanical properties of hydrogels in the swollen state, their applications are greatly limited. Because as a biomedical material, in addition to having certain biosimilarity and compatibility, it also needs to have excellent mechanical strength, stability and deformation recovery performance under external force. Traditional methods to improve the mechanical properties of hydrogels mainly rely on increasin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08J3/075
CPCC08G18/10C08G18/3228C08G18/4833C08G18/5045C08G18/8019C08G2210/00C08G2280/00C08J3/075C08J2375/08C08G18/3243
Inventor 郭明雨崔玉琳檀梅
Owner SUZHOU UNIV
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