Hydrogel and method for preparing same

A technology of hydrogel and water-soluble monomers, which is applied in the field of polymers, can solve the problems of cumbersome weighing of cross-linking agents and initiators to prepare buffer solutions, long duration of the preparation process, and energy-consuming problems, so as to achieve good mechanical properties, The method is simple and the effect is not high

Inactive Publication Date: 2008-04-16
BEIJING NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

The published patent also discloses that hydrogels can be prepared by chemical thermal initiation, but this process still requires a lot of tedious weighing of cross-linking agents and initiators and preparation of buffer solutions
[0005] 2) The process of preparing the first network and the second network must be carried out continuously until the finished produ

Method used

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  • Hydrogel and method for preparing same
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Embodiment 1

[0049] Before the pre-irradiation, oxygenate the polyvinylpyrrolidone PVP (K30) powder for 1 hour, and irradiate it with a cobalt source for 4 hours. The temperature during the irradiation is 100 ℃, and the dose rate is 200 grays per minute. The PVP powder and water are prepared into a solution, and the solution is mixed with acrylic acid. The mass percentage of PVP in the mixed solution is 0.25%, and the mass percentage of acrylic acid is 74.75%. The container will hold the mixed solution after 15 minutes of nitrogen flow. Seal and heat, the reaction temperature is 70℃, and the product will be obtained after 12 hours of reaction. Under the condition of 25℃, the compressive strength of the electronic universal testing machine is tested, and the beam speed is controlled to 10mm / min. The measurement shows that the water content of the sample is 80%, and its compressive strength is 1.45MPa.

Embodiment 2

[0051] Prepare a solution of polyvinyl alcohol (dealcoholization degree above 90%) with water at a mass ratio of 1 / 3, and use a cobalt source to irradiate for 1 hour with a temperature of 40°C and an irradiation dose rate of 300 Gray every minute, after the end of the irradiation, mix the solution with acrylamide. The mass percentage of polyvinyl alcohol in the mixed solution is 15%, and the mass percentage of acrylamide is 40%. After 30 minutes of argon, The container containing the mixed solution is sealed and heated. The reaction temperature is 35℃. The product will be obtained after 24 hours of reaction. At 25℃, the compressive strength of the electronic universal testing machine is tested, and the beam speed is controlled to 5mm / min. . The measurement shows that when the water content of the sample is 90%, the compressive strength is 24.36MPa.

Embodiment 3

[0053] The carboxymethyl chitosan is mixed with water in a mass ratio of 1 / 20 to form a solution, and the cobalt source is used for oxygen irradiation for 3 hours, the temperature is 0°C during the irradiation, and the irradiation dose rate is 250 grays per minute. After the irradiation, the solution was mixed with N-vinylpyrrolidone, the mass percentage of carboxymethyl chitosan in the mixed solution was 2.4%, the mass percentage of N-vinylpyrrolidone was 49.6%, and helium gas After 10 minutes, the container containing the mixed solution was sealed and heated. The reaction temperature was 50°C. The product was obtained after 3 hours of reaction. At 25°C, the compression strength was tested with an electronic universal testing machine to control the beam speed It is 10mm / min. The measurement shows that when the water content of the sample is 80%, the compressive strength is 9.41 MPa.

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Abstract

The present invention relates to a high strength hydrogel and a preparation method thereof. The method is firstly to perform a pre-irradiation and peroxidation process and then a thermal-initiated polymerization process. The pre-irradiation and peroxidation process is to irradiate the water soluble polymer or the water soluble polymer solution in the nitrogen atmosphere by the high energy radiation source to combine the peroxy group on the polymer chains; and the thermal-initiated polymerization process is to mix solution prepared by the water soluble polymer after initiated with the water soluble monomer or mix the water soluble polymer solution after initiated with the water soluble monomer, and then the product is obtained by deoxidizing and heating the mixture. The preparation method of hydrogel of the invention is simple, and the prepared hydrogel has a high mechanical strength, a wide selecting range of the raw materials, and a high applied cost.

Description

Technical field [0001] The invention relates to the field of polymers. Specifically, it is a type of hydrogel and its preparation method, which uses a method of pre-irradiation and peroxidation followed by thermal initiation of polymerization to prepare a high mechanical strength hydrogel. Background technique [0002] Due to its broad application prospects in biomedicine and tissue engineering, smart hydrogels have gradually become a hotspot of research in the past two to three decades, and the preparation of hydrogels with high mechanical strength has gradually become an important research direction. The significance of preparing high mechanical strength hydrogels is that they have great potential application value in tissue engineering as human tissue scaffold materials and human tissue substitutes. [0003] The mechanical strength of the hydrogel is mainly determined by the order of the three-dimensional network structure inside the hydrogel and the degree of cross-linking. W...

Claims

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Application Information

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IPC IPC(8): C08F277/00C08F261/02C08F251/00C08J3/28
Inventor 汪辉亮王毅王雪珍黄庭
Owner BEIJING NORMAL UNIVERSITY
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